Answer:
we can conclude that there is significant evidence to support the stance that mean pH value in water differs from 8.5
Step-by-step explanation:
H0 : μ = 8.5
H1 : μ < 8.5
Test statistic :
(xbar - μ) / s/sqrt(n)
(8.24 - 8.5) ÷ (0.16 ÷ √12)
-0.26 ÷ 0.0461880
Test statistic = - 5.63
The Pvalue can be obtained from the test statistic value using a Pvalue calculator :
df = 12 - 1 = 11
Pvalue = 0.000077
Using an α value of 0.05 ; we can conclude that
Pvalue < α ; We reject H0
Hence, we can conclude that there is significant evidence to support the stance that mean pH value in water differs from 8.5
2(3x + 4y – 5) + 3(2x – 3y + 2)
Answer:
12x−y−4
Step-by-step explanation:
hope this helps!
2. Write your two column proof
PLEASE IF YOU DONT KNOW DONT ANSWER PLEASE
We have:
ab = bc (hypothetical)
so the triangle ABC is isosceles at B
we have: bd is the height of the triangle ABC, so BD is perpendicular to AB
Consider the triangle ABD and the right triangle ACD have:
AB = BC (hypothesis)
BD is the common edge
So the triangle ABD = triangle ACD (hypotenuse - acute angle)
hence the angle ABD = angle ACD
In a sale all items are reduced by 15%. A carpet now costs £15.30 per square metre. What was the price before the sale?
Answer:
,hope it will helpful to youuuuu
Find the Discount % if the OriginalPrice is $15 and the Sale Price is $14.25.
Answer:
5%
Step-by-step explanation:
15-14.25/15
original - sale price divided by original = percent change
15-14.25/15 = 0.75/15 = 0.05 = 5%
Use the transformation uequals=x plus 6 yx+6y, vequals=y minus xy−x to evaluate the given integral by first writing it as an integral over a region G in the uv-plane. ModifyingAbove Modifying Below Integral from nothing to nothing With four sevenths width 0 ModifyingAbove Modifying Below Integral from nothing to nothing With 4 minus 6 y width y (x plus 6 y )e Superscript (y minus x )Baseline dx dy
Answer:
Step-by-step explanation:
if i know
Use Distributive Property to expand the expressions and then simplify.
1/4 (4s + 24.80)
Answer:
The answer is s + 6.2
a train travels 288km at a uniform speed.if the speed has been 4km per hour more it would have taken one hour less for the same journey.find the speed of train
Given:
A train travels 288 km at a uniform speed.
If the speed has been 4 km per hour more it would have taken one hour less for the same journey.
To find:
The initial speed of the train.
Solution:
Let x km/h be the initial speed on the train.
New speed of train = (x+4) km/h
We know that,
[tex]Time=\dfrac{Distance}{Speed}[/tex]
Time taken by the train initially to cover 288 km is [tex]\dfrac{288}{x}[/tex] hours.
New time taken by the train to cover 288 km is [tex]\dfrac{288}{x+4}[/tex] hours.
It is given that If the speed has been 4 km per hour more it would have taken one hour less for the same journey.
[tex]\dfrac{288}{x}-\dfrac{288}{x+4}=1[/tex]
[tex]\dfrac{288(x+4)-288x}{x(x+4)}=1[/tex]
[tex]288x+1152-288x=x^2+4x[/tex]
[tex]1152=x^2+4x[/tex]
[tex]0=x^2+4x-1152[/tex]
Splitting the middle term, we get
[tex]x^2+36x-32x-1152=0[/tex]
[tex]x(x+36)-32(x+36)=0[/tex]
[tex](x+36)(x-32)=0[/tex]
[tex]x=-36,32[/tex]
We know that the speed cannot be negative. So, the only possible value of x is 32.
Therefore, the speed of the train is 32 km/h.
HELP FAST SELECT TWO!!!!
Answer:
2 and 5 are the answers
Step-by-step explanation:
The other ones are blatantly false
Answer: 2 and 5 but don't take my word for it.
Step-by-step explanation:
I need help on this one please
Which is the length of the hypitenuse?
Answer:
20
Step-by-step explanation:
the length of the hypotenuse of a right triangle can be found using the Pythagorean theorem which states that the square of the length of the hypothesis equal the sum of the square of the length of the other two sides
What’s the answer?!!!!!
No it is not a right angle
PLEASEEE HELPPPP OVERRRR DUEEEE!!!!
Answer:
x<-2
Step-by-step explanation:
The open circle indicates that -2 is not included in the qualifications for x, but since the arrow is left, x<-2
The radius of a circle is 3/4 inches. How many inches is the diameter?
Step-by-step explanation:
Given
In a circle
Radius (r) = 3 / 4 inches
Diameter (d)
= 2 * r
= 2 * 3 /4
= 3 /2 inches
Hope it will help :)❤
The diameter of a circle with a radius of 3/4 inches is 6/4 inches.
We are given that;
The radius of a circle = 3/4 inches
Now,
The diameter of a circle is twice the radius of the circle. Therefore, to find the diameter of a circle with a radius of 3/4 inches, we need to multiply 3/4 by 2. We can do this by multiplying the numerators and the denominators:
(3/4) x 2 = (3 x 2)/(4 x 2) = 6/8
We can simplify this fraction by dividing both the numerator and the denominator by their greatest common factor, which is 2:
6/8 = (6/2)/(8/2) = 6/4
Therefore, by the circle the answer will be 6/4.
Learn more about the circle here:
https://brainly.com/question/27455535
#SPJ2
Which espression is equivalent to 7^(-2)*7^(6)
Answer: it’s A and D
Step-by-step explanation:
Al precio de p dólares por unidad, se venden x unidades de cierto artículo al mes en el mercado con p=50-0.5x ¿Cuántas unidades como mínimo se deben vender cada mes con el objetivo de tener ingresos de por lo menos de 1.200 dólares?
Answer:
Se debe vender un mínimo mensual de 40 artículos para tener un ingreso mínimo de 1.200 dólares.
Step-by-step explanation:
De acuerdo con el enunciado, [tex]x[/tex] es la cantidad mínima de artículos a un precio de [tex]p[/tex]. Además, los ingresos totales deben ser de un mínimo de 1200. En consecuencia, tenemos el siguiente sistema de ecuaciones:
[tex]x \cdot p = 1200[/tex] (1)
[tex]p = 50-0.5\cdot x[/tex] (2)
Aplicando (2) en (1), tenemos la siguiente ecuación polinómica:
[tex]x\cdot (50-0.5\cdot x) = 1200[/tex]
[tex]50\cdot x -0.5\cdot x^{2} = 1200[/tex]
[tex]0.5\cdot x^{2}-50\cdot x +1200 = 0[/tex] (3)
Por la Fórmula de la Cuadrática tenemos las raíces del polinomio:
[tex]x_{1} = 60[/tex], [tex]x_{2} = 40[/tex]
De acuerdo con el resultado anterior, se debe vender un mínimo mensual de 40 artículos para tener un ingreso mínimo de 1.200 dólares.
please help asap <3333333
Answer:
5. 89
6. 98
7. 90
8. 130
Step-by-step explanation:
they are all equivalent to the one shown
5. 89, angles equal
6. 98, angles equal
7. 90, right angles
8. 130, angles equal
What is 2/3x + 1/3 - 1/3x
Answer:
1/3x +1/3
Step-by-step explanation:
2/3x + 1/3 - 1/3x
Combine like terms
2/3 x - 1/3x +1/3
1/3x +1/3
Answer:
1/3x + 1/3
Step-by-step explanation:
Solution: put all alphabets and numbers at one side.
2/3x + 1/3 - 1/3x =
2/3x - 1/3x + 1/3 =
1/3x + 1/3
Duane’s scores on the first three math tests this quarter are 82, 74, and 96. Which is the lowest score he could get on the fourth test so that his average score will be at least 80 for the quarter?
Answer:
84
Step-by-step explanation:
(The sum of 82, 74, and 96 would be 252. And the count of numbers included in the question would be 3, and so you would divide the count from the sum as shown like Sum/Count. In this case it'd be 252/3, and that would equal 84.)
Average = Sum/Count
= 252/3
= 84
Solve by Substitution -8x-10y=12 -7x-10y=3
Answer:
Point Form:
(−9,6)
Equation Form:
x=−9,y=6
Step-by-step explanation:
what is the value of the expression shown below 6+(9-1)^2÷4×1/2^4
Answer:
280
Step-by-step explanation:
[6 + (9 - 1)²] ÷ 4·(1/2)^4
= 6 + 8² ÷ 4 · 1/16
= 6 + 64 ÷ 1/4
= 70 ÷ 1/4
= 70 x 4
Yes or no ???????????
It is a right triangle.
An arctic wooly bear caterpiller lives for 7 years and spends 90% of its life frozen. How many days of its life is the arctic wolly bear frozen.
Answer:
The arctic wolly bear is frozen 2,299.5 days of its life.
Step-by-step explanation:
With the information provided, first, you have to calculate the number of days in 7 years by multiplying 7 years for 365 that is the number of days in a year:
7*365=2,555
Then, you have to calculate 90% of 2,555 since the statement indicates that the arctic wooly bear caterpiller spends 90% of its life frozen:
2,555*90%=2,299.5
According to this, the answer is that the arctic wolly bear is frozen 2,299.5 days of its life.
What is the measure of RMN? (Don't understand how to get the answer)
Answer:
RMN+117°=180°
RMN=180°-117°
RMN=63°
SUM OF ANGLE ON A STRAIGHT LINE ADD UP TO 180°
solve for x if 2/3x = 10
a. 20/3
b. 15
c. 9 2/3
d. 10 1/3
heeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeelp
meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
how do you get to zero
hurry! points if you answer quickly!
Which table contains a set of ordered pairs that appear to lie in
graph of a linear function?
Answer:
C
Step-by-step explanation:
It is going up and down by the same amount constantly
PLEASE HELP I NEED THIS ASAP/ Find A ∩ B if A = {3, 6, 9, 12} and B = {2, 4, 6, 8, 10, 12}.
{6, 12} {
24, 48}
{2, 3, 4, 6, 8, 9, 10, 12}
Answer:
I believe the ans is
A ⋂ B = { 6, 12 }
Explanation :
The set operation intersection contains only the elements that are in both set
A ⋂ B
HELP!!! (the correct answer will be marked as brainliest)
The salary of fast food store branch manager is 3 times more than a part time employee salary, $x per day. Working hours for part time employees are half of the manager's working time, y within a month. If they work 26 days in a month, write the formula for the difference in salary, $z between the two workers in terms of x and y.
Answer:
Step-by-step explanation:
Part time workers daily rate = x.
Managers daily rate y = 3x.
Find the difference.
2 1/6 - 1 3/6
1/6
3/6
4/6
1 4/6
Answer:
The difference is 4/6
2 1/6 - 1 3/6 = 4/6
What is the volume, in cubic feet, of this composite figure? (Do not write
the units.) *
1 ft
2 ft
5 ft
3 ft
9 ft