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umka2103 [35]
3 years ago
9

Kat and Carter are washing cars to make some money. Kat only has $10 saved up in

Mathematics
1 answer:
Yakvenalex [24]3 years ago
8 0

Answer:

the answer is d

Step-by-step explanation:

it was bc they would both have the esasjdhjadsdjahjdjdshjashdjashdjashdjhasdbn hukmx n asnsassssssan knsmnkkjndnmsnzxnzzzzzzzzzzzzzzzzzzzzzzzzznxnnznxnznxnznxnzxz nxnz xnz xn znx zn xnz xn znx zn xnz xnz xnz xn znx nz xnz xn znx nz xnz xnz nx zn xnz xnz nx zn xnz nx znx nz xn znx nz xnz xnz nx n xnz nx zn xnz nx zn xnz xn zn xn zn xnz xn nz xn znx n xnz xn nz xn xnz x nzxn zn xnznx nzxn nz xn znx nz nx nz xn zn xnz xn zn                          nzx znxzn xn zn xnz xn z xn ehbhbhbhbxb b zbx bx zbx zb xbz xbzx bx bz xb zbxzb xb zbx bzx bz xbz xb zbx zb xbz xb zb bx zbx bz xbz xbz bx zbx bz xbz bx bz xbz xbz bx

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Solve the following system of equations via elimination.<br> 12x – 9y = 30<br> 6x+15y=54
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Answer:

x=4,y=2

Step-by-step explanation:

solve one of the equations for x/y and then plug it into the other

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Make y the subject of the formula.
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b

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because it is the correct one

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If a ray lays in a plane, how many points of the ray are also in the plane?
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Starting in the 1970s, medical technology allowed babies with very low birth weight (VLBW, less than 1500 grams, about 3.3 pound
cluponka [151]

Answer:

The test statistic value using the VLBW babies as group 1 is z=-2.76±0.01 and the P-value for the test (±0.0001) is 0.0030.

Step-by-step explanation:

This is a hypothesis test for the difference between proportions.

The claim is that the proportion of persons with normal birth weight that graduates from high school is significantly greater than the proportion of persons with very low birth weight that graduates from high school.

Then, the null and alternative hypothesis are:

H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2> 0

The significance level is 0.05.

The sample 1 (VLBW group), of size n1=244 has a proportion of p1=0.77049.

p_1=X_1/n_1=188/244=0.77049

The sample 2 (control group), of size n2=247 has a proportion of p2=0.79757.

p_2=X_2/n_2=197/247=0.79757

The difference between proportions is (p1-p2)=-0.02708.

p_d=p_1-p_2=0.77049-0.79757=-0.02708

The pooled proportion, needed to calculate the standard error, is:

p=\dfrac{X_1+X_2}{n_1+n_2}=\dfrac{188+197}{244+247}=\dfrac{385}{491}=0.988

The estimated standard error of the difference between means is computed using the formula:

s_{p1-p2}=\sqrt{\dfrac{p(1-p)}{n_1}+\dfrac{p(1-p)}{n_2}}=\sqrt{\dfrac{0.988*0.012}{244}+\dfrac{0.988*0.012}{247}}\\\\\\s_{p1-p2}=\sqrt{0.00005+0.00005}=\sqrt{0.0001}=0.0098

Then, we can calculate the z-statistic as:

z=\dfrac{p_d-(\pi_1-\pi_2)}{s_{p1-p2}}=\dfrac{-0.02708-0}{0.0098}=\dfrac{-0.02708}{0.0098}=-2.76

This test is a left-tailed test, so the P-value for this test is calculated as (using a z-table):

P-value=P(t

As the P-value (0.0030) is smaller than the significance level (0.05), the effect issignificant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the proportion of persons with normal birth weight that graduates from high school is significantly greater than the proportion of persons with very low birth weight that graduates from high school.

3 0
3 years ago
Would the answer be b an d for this
Paladinen [302]
Answer by answer key by key question equals equation
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