Answer:
Step-by-step explanation:
2x² - 3x - 15 = 5
2x² - 3x - 20 = 0
Quadratic formula
x = [3 ± √(3² – 4·2(-20))] / [2·2]
= [3 ± √169] / 4
= [3 ± 13] /4
= -2.5, 4
Which fraction would make this equation true? 9 x ? = 6 3/4
Answer:
3/4
Step-by-step explanation:
6.75/9= .75
.75= 3/4
What is the value of x in the following ayatem?
6x + 3y = 15
Answer:
[tex]x=\frac{5-y}{x}[/tex]
Step-by-step explanation:
Van wants to build a square field with a fence around the outside. If he has 104 feet of
fencing, what should be the length of each side of his field?
Answer:
26
Step-by-step explanation:
104 divided by the 4 sides (for perimeter) equals 26
A study was conducted on the effects of long-term marriage (more than 10 years). Researchers gathered data from a random sample of 4,563 adults and measured quite a few variables, in addition to the explanatory variable of marriage and the response variable of longer life span. According to a newspaper article summarizing the study, those in long-term marriages were more likely to be more physically active, at a healthy weight, and nonsmokers. Those who were not married were about 20% more likely to be deceased. What conclusion can we draw from this study
Answer:
We cannot infer a cause and effect relationship because the treatments imposed were not blocked correctly.
Step-by-step explanation:
The treatments given to the groups given in the question where not assigned proper treatments to establish proper randomized block design.
Thus, we can say the conclusion is that we can't truly infer a cause and effect relationship as the blocks were not properly done.
please help this is due in 5 minutes
Answer:
23 inches
Step-by-step explanation:
how many times does to go into 50000
Answer: 2500
Step-by-step explanation:
Answer:
2500
Step-by-step explanation:
Solve the system
2x+3y=9
-2x - 9y + -15
sorry if this does not make sense pls help me
Answer:
i would probably try looking it up and really srr i can't help much
bajar dos numeros de las que aparecen en la primera seccion, segundo: el resultado irá con el segundo dijito de la ( y) y despues dividirlo entre el numero que dio al multipliar esos dijitos
Solve. Show each step.
5.4 - 6x = -6
Answer:
x = 1.9
Step-by-step explanation:
5.4 - 6x = -6
Gotta isolate the x, so you would minus 5.4 from both sides:
5.4 - 5.4 - 6x = (-6) - 5.4
5.4 - 5.4 cancels out, and (-6) - 5.4 is -11.4 What's left is:
- 6x = -11.4
Gotta isolate the x, so divide -6 to both sides. It negative because the sign in front of it is a subtraction sign, it would be positive if there is a addition sign:
- 6x/(-6) = (-11.4)/(-6)
-6 divide by -6 cancels out, and -11.4 divided by -6 is 1.9. A negative divided by a negative is a positive. Result, x is now isolated:
x = 1.9
What value of s in the equation S/6=18?
A.108
B.24
C.12
D.3
Answer:
108
Step-by-step explanation:
s=18x6
s=108
PLS HELP ME PLZZ!!!!!!!!!!!! =)
x/6 - 10 =2
Show your work.
Answer:
72
Step-by-step explanation:
x/6 - 10 = 2
x/6 = 12 (add 10 to both sides)
x = 72 (multiply 6 to both sides)
PLEASE HELP, WILL GIVE BRAINLIEST!!!!!!!!
Answer: 77745
Step-by-step explanation:lol
Can Someone Plz Help me???!!!
The Answers are
A 480
B 360- IT’S NOT B!
C 272
D 368
Plz Help Me!!
Answer:
D) 368
Step-by-step explanation:
you already have 2 of the sides of WXYZ (120 is the length of both long sides). to get the length of the shorter side (YZ), you can solve for the 3rd side of the triangle WYZ using the pythagorean theorem, which states that the square root of the different between the square of the hypotenus (the line YW, which is 2 * 68 for WYZ) and the square of the known side (WZ, which is 120 here) is equivalent to the unknown side (YZ). using that info,[tex]\sqrt\\(2 *68)^{2} - 120^{2}[/tex] = 64, so 64 is the length of YZ. the perimeter of WXYZ is (2 * WZ) + (2 * YZ) = (2 * 120) + (2 * 64) = 368. therefore, the perimeter of WXYZ is 368!
2. A bookshelf costs $300 normally. Today it is on sale for 20% off. Which expression or expressions could you use to find the sale price? Circle all correct answers.
a.300 + 0.2(300)
b.300 - 0.2(300)
c.0.2(300)
d.300(0.8)
Answer/Step-by-step explanation:
$300 is the normal price the sale is 20% off
You would need to multiply them together because it then gives you how much it is off.
Then then you would subtract it.
That takes D and C off.
A , is adding and we arnt adding we are subtracting.
Therefore you answer is: B
The rent for a one-bedroom apartment in Southern California follows the normal distribution with a mean of $2,350 per month and a standard deviation of $260 per month. The distribution of the monthly costs does not follow the normal distribution. In fact, it is positively skewed. What is the probability of selecting a sample of 65 one-bedroom apartments and finding the mean to be at least $2,260 per month
Answer:
0.9974 = 99.74% probability of selecting a sample of 65 one-bedroom apartments and finding the mean to be at least $2,260 per month.
Step-by-step explanation:
To solve this question, we need to understand the normal probability distribution and the central limit theorem.
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
The rent for a one-bedroom apartment in Southern California follows the normal distribution with a mean of $2,350 per month and a standard deviation of $260 per month.
This means that [tex]\mu = 2350, \sigma = 260[/tex]
Sample of 65 one-bedroom apartments
65>30, which means that the sampling distribution of the sample means will be approximately normal. Also, [tex]n = 65, s = \frac{260}{\sqrt{65}} = 32.249[/tex]
What is the probability of selecting a sample of 65 one-bedroom apartments and finding the mean to be at least $2,260 per month?
This is 1 subtracted by the pvalue of Z when X = 2260.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{2260 - 2350}{32.249}[/tex]
[tex]Z = -2.79[/tex]
[tex]Z = -2.79[/tex] has a pvalue of 0.0026
1 - 0.0026 = 0.9974
0.9974 = 99.74% probability of selecting a sample of 65 one-bedroom apartments and finding the mean to be at least $2,260 per month.
The National Institute of Mental Health published an article stating that in any one-year period, approximately 9.5 percent of American adults suffer from depression or a depressive illness. Suppose that in a survey of 100 people in a certain town, seven of them suffered from depression or a depressive illness. If you were conducting a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population, what would the null and alternative hypotheses be? (Note = refer to top of page 508 for format and appropriate equality and non-equality symbols, respectively)a. H0 :______b. Ha :______
Answer:
a) [tex]H_{0} = 9.5[/tex]
b) [tex]H_{a} < 9.5[/tex]
Step-by-step explanation:
The National Institute of Mental Health published an article stating that in any one-year period, approximately 9.5 percent of American adults suffer from depression or a depressive illness.
At the null hypothesis, we test if the value we find is equal to the expected value, that is:
[tex]H_{0} = 9.5[/tex]
Test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population
Lower, which means that the alternate hypothesis, we test if the value we find is lower than the expected value, that is:
[tex]H_{a} < 9.5[/tex]
Select
2x + 1 =23
10
Dictionary
N 48-3 = 17
Text to Speech
+
Markup
6x + 3 = 15
-2x + 2 = 4
- 4x + 6 = -30
3.x
1 Comment
3r + 30 =
T Text Box
2x +8= -16
8x - 18 = 30
Equation
8x - 8 =
- 3x + 40 = 10
Drawing
-X-6 = 3
6x + 30 = -6
-x+1=
Shapes
-x-8=0
3x - 26 = 10
--x+1=1
Eraser
Add Media
- 9x - 35 = 10
4x - 8 = 8
-x+1=0
ignature
<
7
Answer:
753
Step-by-step explanation:
Help pls ............
how do you find commission rate
Answer:
To find the commission on a sale, multiply the rate of commission by the total sales.
Step-by-step explanation:
Henri’s potato vine is growing like crazy! When he planted it, it was 15 inches long. Two weeks later, it was 22 inches long. Four weeks after that, it was 36 inches long. Write an equation to represent this situation.
Answer:
1x = 7
Explanation:
Every week it grows 7 total inches. So, "x" stands for week. The equation "1x = 7" means 1 week equals 7 inches. This is the simplest equation to write this problem.
Blocks numbered through 9 are placed in a box, and a block is randomly picked.
The probability of picking an odd prime number is. The probability of picking a number greater than o that is also a perfect square
Answer:
the probability for that would be 1/3 or 3/9
Which of the following intervals expresses:
-5
Answer:
please ask question clearly I am not even getting question.
Step-by-step explanation:
Find the area of the trapezoid.
12 2 cm
10 2 cm
126 cm
[? ] cm
Enter the exact answer. Do not round.
A rectangular region is removed from another rectangular region to create the shaded region shown below. Find the area of the shaded region.
Step-by-step explanation:
8x13 kkkxkgkgxkgxkkkxkkk
HELP DONT TRY ME I WILL REPORT IF WRONG ANSWER FAST I WILL +BRAINLIEST
Answer:
I think its 2/3 x 4
If point (-3,4) is reflected over the x-axis, what are the coordinates of its image?
Answer:
(-3, -4)
Step-by-step explanation:
because of the quadrant it is in, both numbers would be negative.
(NOT A MULTIPLE CHOICE)
Suppose a civic engineer wants to conduct a survey to find out if residents of a city would be in favor of widening one of the city's roadways for increased traffic flow
a. Would a sample consisting of residents who utilize that roadway to travel to work each morning be representative? Explain.
b. Would a sample consisting of residents who live along that roadway be representative? Explain.
c. Would a random sample of homeowners in the city be representative? Explain.
9514 1404 393
Answer:
a, b, c --- all not representative
Step-by-step explanation:
The question posed by the engineer is "are residents of the city in favor of ...".
The only representative sample is one from a pool that includes all residents of the city—not just those who (a) use the road, (b) live along the road, or (c) own homes.
__
Additional comment
The engineer may want to refine the question. As posed, it would include children, homeless, and/or institutionalized residents of the city as well as drivers and tax-payers. In inclusive cultural traditions, "residents of the city" may also include animals, plants, water, air, and other holders of spiritual energy.
I NEED AN EXPLANATION
=7×9
=36 square feetffgxdx
How many solutions does the system have?Explain
Y=2x+3
-4x+2y=8
Please anyone help !?
Answer:
0
Step-by-step explanation:
-4x+2(2x+3)=8
-4x+4x+3=8
6=8
0=2
no solution
please help me :))))
Answer:
Answer is d hope this helps :)
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
because its probability