a researcher finds 200 women over 50 who exercise regularly, pairs each with a woman who has a similar medical history but does not exercise, then follows the subjects for 10 years to see which group develops more cancer. this is a ...
A researcher finds 200 women over 50 who exercise regularly, pairs each with a woman who has a similar medical history but does not exercise, then follows the subjects for 10 years to see which group develops more cancer. this is a prospective study.
Define prospective study.Individuals are tracked over time in prospective studies, and information is gathered about them as their characteristics or circumstances change. Prospective studies include things like birth cohort studies. In retrospective research, people are sampled, and details about their past are gathered. Always after a predetermined number of incidents, the analysis takes place. The fact that individuals were enrolled and baseline data was obtained before any subjects experienced an outcome of interest identifies a study as prospective.
Given,
A researcher finds 200 women over 50 who exercise regularly, pairs each with a woman who has a similar medical history but does not exercise, then follows the subjects for 10 years to see which group develops more cancer. this is a ...
Prospective study
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1. What are The two taxes paid on most purchases?
Answer:
I believe its the FICA and the payroll taxes
Step-by-step explanation:
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help meeeeeeeeeeeeeeeeeee pleaseeee rn rnnnnnnnnnn!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The function f(x) = [tex]-3x^2[/tex] + 18x + 3 has the maximum value of 30 at x = 3
The quadratic function is
f(x) = [tex]-3x^2[/tex] + 18x + 3
The general form of the quadratic function is
y = [tex]ax^2[/tex] + bx + c
If a < 0, the quadratic function has maximum value
Here the value of a = -3
Therefore the function has maximum value.
Maximum value will be at x = -b / 2a
= -18 / 2(-3)
= -18 / -6
= 3
The maximum value of quadratic function will be (4ac - [tex]b^2[/tex]) /4a
Substitute the value in the equation
(4ac - [tex]b^2[/tex]) /4a = (4×-3×3 - 18×18) / 4×-3
= (-36 - 324 / -12
= -360 / -12
= 30
Hence, the function f(x) = [tex]-3x^2[/tex] + 18x + 3 has the maximum value of 30 at x = 3
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can someone help pls
What is the product?
3 6 1
24 0
0 6 2
x 2 0 1
Answer:
Step-by-step explanation:
Need some help on this question:
The rule to get from one term to the next in a sequence is
Un+1 = 2Un
If U1=4, work out the values of U2, U3 and U4.
Will mark as Brainliest if correct answer is given. Thanks.
Answer:
8, 16, 32
Step-by-step explanation:
using the recursive formula [tex]U_{n+1}[/tex] = 2[tex]U_{n}[/tex] and U₁ = 4 , then
U₂ = 2 U₁ = 2 × 4 = 8
U₃ = 2 U₂ = 2 × 8 = 16
U₄ = 2 U₃ = 2 × 16 = 32
Plot the image of point P under a translation by 7 units to the left.
Answer:
-1,4
Step-by-step explanation:
move the point to the left 7 times
At barlow school ,4/9 of the 873 students are boys at willow school, 2/3 of the 630 are girls which school has the greater number of boys and by how many
Answer:
Barlow School has 178 more boys
Step-by-step explanation:
At Barlow School, 4/9 of 873 students are boys. At Willow School, 2/3 of 630 students are girls. You want to know which school has more boys, and by how many.
Barlow SchoolThe number of boys is ...
4/9 × 873 = 388
Willow SchoolThe 1/3 of students that are not girls are presumed to be boys. That number is ...
1/3 × 630 = 210
DifferenceThe difference in the number of boys is ...
388 -210 = 178
Barlow School has 178 more boys.
A source of money that allows individuals to pay for goods and services later is called _____. (1- consumer credit, 2- earned income, 3- capital) an advantage of this source of money is that ____. (1- it can be used to shop online, 2- there are no interest charges, 3- there are no penalties for delayed payment) i need answers fast.
A source of money that allows individuals to pay for goods and services later is called consumer credit and an advantage of this source of money is that there are no interest charges.
Consumer credit, also known as consumer debt, enables the consumers to incur debt or borrow money and to defer repayment of that money over time. It allows consumers to buy goods without having to pay for them in cash at the time of purchase. Examples of consumer credit include credit cards, student loans, etc. Among the advantages of using consumer credit is that there is no interest charge to borrow the money for a certain period of time until the due date.
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In the figure alongside, AB⊥BC and a-b =10° then find the value of a and b
Step-by-step explanation:
a-b=10--(1)
Same side interiors(vertical) have sum 180°
a+b=180--(2)
From both equations
2a=190
a=95
And
a-b=10
b=95-10
b=85
Write the function whose graph is the graph of y = x2, but is shifted to the left 2 units.
The function whose graph is shifted 2 units to the left is y = (x + 2)² .
In the question ,
it is given that the equation is given as y = x² .
we know that when the function y = x² is shifted " a units " to the left , the shifted function becomes y = (x + a)² ,
we have to find the equation of the graph that is shifted 2 units to the left ,
So , the value of a is 2 ,
and the equation becomes
y = (x + 2)²
so , the equation is y = (x + 2)² .
the graph is shown below .
Therefore, The function whose graph is shifted 2 units to the left is y = (x + 2)² .
The given question is incomplete , the complete question is
Write the function whose graph is the graph of y = x², but is shifted to the left 2 units ?
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an equilateral triangle and a regular hexagon have perimeters of the same length. if the area of the triangle is 2 square units, what is the area of the hexagon?
The area of hexagon is found to be 18 square units by using the giving conditions.
What is the equation for calculating a hexagon's perimeter?P = 6a, where an is the length of one of its sides, is the formula for a regular hexagon's perimeter. Here, the hexagon's interior angles are all 120 degrees.
How do you calculate a hexagon's area?The formula for calculating the area of a hexagon is derived from the formula for calculating the area of an equilateral triangle since a regular hexagon is made up of six equilateral triangles. The formula for calculating a hexagon's area is 6([tex]\sqrt{3}[/tex]/4)a² where a is the regular hexagon's side length.Given: The perimeters of an equilateral triangle and a regular hexagon are equal.
We need to find the area of the hexagon.
Let,
x = side of trainagle
a = side of hexagon
3x = 6a
x = 2a
Area of equilateral triangle = ([tex]\sqrt{3}[/tex]/4)x² = 12 square units
Area of hexagon is given as follows:
= 6([tex]\sqrt{3}[/tex]/4)a²
= (6[tex]\sqrt{3}[/tex]/4)(x²/4)
= 12(6)/4
= 18 square units
Therefore, the area of hexagon is found to be 18 square units by using the giving conditions.
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Nick starts with 20
20
milligrams of a radioactive substance. The amount of the substance decreases by 12
1
2
each week for a number of weeks,
w
. He writes the expression 20(12)
20
(
1
2
)
w
to find the amount of radioactive substance remaining after
w
weeks.
Autumn starts with 1
1
milligram of a radioactive substance. The amount of the substance decreases by 50%
50
%
each week for a number of weeks,
w
. She writes the expression (1−0.5)
(
1
-
0
.
5
)
w
to find the amount of radioactive substance remaining after
w
weeks.
Use the drop-down menus to explain what each part of Nick's and Autumn's expressions mean.
Each part of Nick's and Autumn's expressions mean can be explained as follows;
Nick;
the amount of substance he begins with = 20the amount of substance left after each week = 1/2Autumn:
The one outside of parentheses = the initial amount of the substance.The one inside of parentheses = 100% of the original amount of the substance.0.5 represents the 50% of the substance that is lost each time periodHow to explain each variable in an expression?ler
Number of weeks = wNick expression:
[tex] {20( \frac{1}{2} })^{w} [/tex]
Where,
the amount of substance he begins with = 20
the amount of substance left after each week = 1/2
If w = 2
[tex] {20( \frac{1}{2} })^{w} [/tex]
[tex]{20( \frac{1}{2} })^{2} [/tex]
= 20(0.25)
= 5 milligrams
Autumn's expression:
[tex] {(1 - 0.5)}^{w} [/tex]
The one outside of parentheses = the initial amount of the substance.
The one inside of parentheses = 100% of the original amount of the substance.
0.5 represents the 50% of the substance that is lost each time period
If w = 2[tex] {(1 - 0.5)}^{w} [/tex]
[tex] {(1 - 0.5)}^{2} [/tex]
= (0.5)²
= 0.25 milligrams
Complete question:
Nick starts with 20 milligrams of a radioactive substance. The amount of the substance decreases by 1/2 each week for a number of weeks, w. He writes the expression 20(12)w to find the amount of radioactive substance remaining after w weeks. Autumn starts with 1 milligrams of a radioactive substance. The amount of the substance decreases by 50% each week for a number of weeks, w. She writes the expression (1-0.5)w to find the amount of radioactive substance remaining after w weeks. Use the drop-down menus to explain what each part of Nick's and Autumn's expressions mean.
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help meeeeeeeeeee pleaseeeeeeeeeeeee!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Can't be solved
Step-by-step explanation:
Using Pythagoras theorem,
H2= O2 + A2 (where, H= Hypotenuse,O=Opposite,A=Adjacent)
The hypotenuse,H=7feet long
If the opposite side of the triangle is 4 feet longer than the adjacent side, then;
O=A+4
while, A=A
,then using H^2= O^2 + A^2(The 2 are power,that is square)
7^2 = (A+4)^2 + A^2
49= (A+4)(A+4) + A^2
49=A^2 +4A+4A+16 + A^2
49=A^2+8A+16+A^2
(collect like terms)
49-16=A^2+A^2+8A
33=2A^2+8A
Then a quadratic equation,
2A^2+8A=33
2A^2+8A-33=0,
using (-b+/-√4ac) /2a
where b=8, a=2, c=-33
[-8 +/-√4*2*(-33) ]/2(2)
-8 +/-
What is the equation of the line that passes through the point (1, -3) and has a
slope of -3?
The equation of the line is, y = -3x.
What is point slope form of the line?
A line's point slope form equation is y - y1 = m(x – x1). Consequently,
y - 0 = m(x - 0), or y = mx, is the equation of a line passing through the origin with a slope of m.
Let the line passes through the point (1, -3) and having slope of -3.
Consider, the point slope form of the line,
[tex]y-y_1=m(x-x_1)[/tex]
Plug, [tex](x_1, y_1) = (1, -3), m = -3[/tex]
So, the above equation becomes
[tex]y-(-3)=-3(x-1)\\y+3=-3x+3\\y=-3x+3-3\\y=-3x[/tex]
Hence, the equation of line that passes through the point (1, -3) and having slope -3 is y = -3x.
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james has an empty coin jar. He adds 3 dimes, 2 quarters, and 7 nickels into the jar. The next day, she removes 3 quarters and 3 nickels. How much money will James have in the jar?
Answer: 25 cents i am sorry if this is wrong
Step-by-step explanation: 3 dimes are 30 cents plus 50 is 80 plus 35 is $1.15 so then when she removers 3 nickles she is getting rid of 15 cents which would leave $1.00 finally when you remove 75 cents you have 25 cents
what is the probability that at most eight of ten independently selected specimens have a hardness of less than 73.84?
The probability that at most eight of ten independently selected specimens have a hardness less than 73.84 is 0.2639.
Probability:
The chance that a particular event (or set of events) will occur is expressed on a linear scale from 0 (impossibility) to 1 (certainty), also expressed as a percentage between 0 and 100%. The analysis of events governed by probability is called statistics.
Here we have to find the probability:
The probability that each specimen has a hardness less than 73.84 is:
p =Ф( Z< 973.84 - 70)/ 3)
= Ф(Z<1.28 ) = 0.899
P(X<=8) = 1 - P(X=9) - P (X=10)
= 0.2639
So out of 10 specimens, the probability that 8 or fewer have a hardness less than 73.84 is 0.2639
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Alexi like her drink to have a ratio of liquid yo ice of 1 to 3. A fat food retaurant put 16 oz of ice in her 32 oz cup
Alexi will not like the drink because the ratio of liquid to ice is 1/1.
Alexi likes her drink to have a liquid-to-ice ratio of about 1/3. A fast food restaurant put 16 ounces of ice in her 32-ounce cup. We need to find out if Alexi will like her drink or not, and if not, why not.
Let the ratio of the liquid to the ice in the drink be represented by the variable "R". The total volume of the cup is 32 ounces. The amount of ice in the cup is 16 ounces. So the amount of liquid in the drink is the difference between these two amounts. Hence, the amount of liquid in the cup is 32 - 16 = 16 ounces.
The ratio of the amount of liquid to the amount of ice in the drink is calculated below.
R = 16/16
R = 1/1
Hence, the ratio of the amount of liquid to the ice in the drink is 1/1. So, Alexi will not like her drink.
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A right triangle contains a 25° angle.
a.) If one leg is of length 5 inche, what is the length of the hyp?
b.) There are 2 answers. How is this possible?
If one leg is of length 5 inches then the lengths of the hypotenuse can be 2.113 inches or 4.5315 inches.
According to the question,
We have the following information:
A right triangle contains a 25° angle and length of one leg is 5 inches.
Now, the leg for which length is given can be opposite to given angle or adjacent to given angle. So, there are two possible for the length of hypotenuse (H).
Now, when it is opposite to the given angle:
Sin 25 = 5/H
H = Sin 25*5
H = 0.4226*5
H = 2.113 inches
Now, when it is adjacent to the given angle:
Cos 25 = 5/H
H = Cos 25*5
H = 0.9063*5
H = 4.5315 inches
Hence, if one leg is of length 5 inches then the lengths of the hypotenuse can be 2.113 inches or 4.5315 inches.
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Encuentre dos números positivos cuyo producto es 25 y cuya suma es un mínimo. (Especifica el valor minimo y maximo si los dos valores no son lo mismo.)
The two positive numbers are 5 , 5.
Given:
Product of two positive numbers = 25
sum of these number is minimum.
Let a and b be the two positive numbers.
a*b = 25
b = 25/a
sum s = a+b
= a + 25/a
apply derivation on both sides.
ds/da = 1 - 25/[tex]a^{2}[/tex]= 0.
1 = 25/[tex]a^{2}[/tex]
a = [tex]\sqrt{25}[/tex]
a = 5 , -5
since given are positive numbers so 5 is considered.
b = 25/5
b = 5
Therefore the two positive numbers are 5 , 5.
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4X-3(x-2)=2(3x-2) I really need help on this one
The green point is marked on the coordinate plane. What ordered pair represents the green point?
Answer:
pretty sure its (-6, -4)
Step-by-step explanation:
in the ||| quadrant so I know they are both negative.
The point is 6 units to the left and 4 units down.
Hope this helps! Good luck!
What is the probability that a randomly selected person is a girl given they are an 8th grader?
Answer:
76
Step-by-step explanation:
What are the two square roots of 1/121
Answer:
-1/11, +1/11
Step-by-step explanation:
You want the two square roots of 1/121.
Square rootA square root can be either positive or negative.
[tex]\pm\sqrt{\dfrac{1}{121}}=\pm\dfrac{1}{\sqrt{121}}=\boxed{\pm\dfrac{1}{11}}[/tex]
__
Additional comment
The √ symbol generally means the principal square root, the positive root. To get the negative root, we precede the symbol with a minus sign. So, both square roots are identified as ±√( ).
A city planner wants to build a road perpendicular to d street. What should be the slope of the new road?.
If a line's angle with the x-axis is then, that line's slope will be tanα, and the new road's slope will be tan(0) = 0.
D Street is depicted as a vertical line with a 90° angle of inclination in the accompanying figure. In other words, D Street has an infinite slope.
The new road will therefore have 0° of inclination if it is perpendicular to D street because if they are perpendicular and D street is vertical, the new road is level and has 0° of inclination.
A horizontal line now has zero slopes.
The new road has a zero slope as a result.
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At 61°F, a certain insect chirps at a rate of 99 times per minute, and at 64°F, they chirp 117 times per minute. Write an equation in slope-intercept form that represents the situation.
An equation in slope-intercept form that represents the situation is C(x) = -267 + 6x.
What is the equation in slope intercept form?A linear equation is an equation that has a single variable that is raised to the power of one. When shown on a graph, a linear equation is a straight line that can slope either upward or downward.
The general form of a linear equation is
y = mx + b
Where:
b = intercept y = dependent variable x = independent variable m = slopeSlope = change in the chirps / change in the temperature
Slope = (117 - 99) / (64 - 61)
Slope = 18 / 3
Slope = 6
99 = a + 6x
99 = a + 6(61)
99 = a + 366
a = 99 - 366
a = -267
C(x) = -267 + 6x
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Write the polynomial in standard form. Then
name the polynomial based on its degree and number of terms.
3. g-6g³+10g²-3
a. 6g³-10g²+g-3; cubic trinomial
b. -3+g+10g²-6g³; cubic binomial
c. -6g³+10g²+g-3; cubic polynomial
d. 10g³-6g²+g-3; quadratic binomial
in a hypothesis testing that you are conducting, you determine the confidence level needed is 99%. for you to reject the null hypothesis, the p-value needs to be:
The answer to the given question is <0.01.
What is confidence level?
The confidence level is the percentage of times we expect to get near to the same approximate if we run our experiment again or resample the population in the same way. The confidence level is the probability that the null hypothesis is true.
What is p-value?
P-value is the probability of getting the results you did, given that the null hypothesis is true.
When we are conducting a hypothesis testing and we determine the confidence level needed is 99%; then in order to reject the null hypothesis, the p-value needs to be below 0.01 (<0.01).
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K =
√2abc
1 + a²-b(squared)+c² - 5b
If a = 4, b = -2 and c = -1
evaluate K
K=
Please help desperately I don’t know this. Burt keeps honeybees on his farm. When he first started, here’s a six room beehive that held 40 pounds of honey. Now he uses a 30 for a beehive. It has the same ratio and frames to Honey as a smaller beehive.
How much money does birds new beehive hold?
The ratio of frames to honey is the same as in a smaller beehive. 200 pounds of honey can be found in Bert's new beehive.
What is an expression?The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.
Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.
Given data:
Number of frame beehives = 6
Pound of honey = 40
Current Frame beehive = 30
The first step is to formulate an equation and then use the formulated equation to find the number of honey
E = 40 × 30 ÷ 6
E = 40 × 5
E = 200 honey
Therefore the number of honey is 200.
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