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Genrish500 [490]
3 years ago
10

Tamara bought yarn for $39 and 2 pairs of knitting needles. Her total cost for the yarn and knitting needles was $69. Tamara wri

tes an equation that represents the cost of each pair of knitting needles. If k represents the cost of each pair of knitting needles, which statements about verifying the value of k are true? Check all that apply.
Mathematics
2 answers:
Sati [7]3 years ago
7 0
If you see the below statements among the choices, then you can select these as the answers:
a.) 39 + 2k = 69
             2k = 69 - 39
          2k/2 = 30/2
               k = 15

b.) 39 + 2k = 69
 39 + 2(15) = 69
     39 + 30 = 69
             69 = 69
Papessa [141]3 years ago
7 0

Answer:

A and B

Step-by-step explanation:

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What is the negative inverse of -0.3
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A​ true/false test has 8080 questions. Suppose a passing grade is 5252 or more correct answers. Test the claim that a student kn
Makovka662 [10]
<h2>Answer with explanation:</h2>

Let p be the proportion of the correct answers.

As per given , we have

H_0: p=0.50

H_a: p>0.50 , since the alternative hypothesis is right tailed , so the test is a one -tailed test.

If the student gets 52 answers correct out of 80.

i.e. the proportion of correct answers : \dfrac{52}{80}=0.65

Test statistic : z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

z=\dfrac{0.65-0.50}{\sqrt{\dfrac{0.50(0.50)}{80}}}\approx2.68

P-value : P(z>2.68)=0.0037   [ by using p-value table for z (right-tailed)]

Since the p-value(0.0037) is less than the significance level (0.05), so we reject the null hypothesis.

Results : We have enough evidence to support the claim that a student knows more than half of the answers and is not just guessing.

8 0
3 years ago
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Answer:

E. none of the above

Step-by-step explanation:

20 doesnt fit any of these answers

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