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3 years ago

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Ms.Gartland bought x number of shirts for the new members of her chorus.The cost for x number of shirts,including $3.99 shipping

,was $77.49.Each shirt cost $12.25.There was no sales tax on his purchase.which equation could be used to find x?

2 answers:

lorasvet [3.4K]3 years ago

6 0

1

77.49 - 3.99 = $73.5

73.5 / 12.25 = 6 Shirts

Ann [662]3 years ago

3 0

$\\
\text{Ms.Gartland bought x number of shirts for the new members of her chorus.}\\
\text{The cost of x shirts, was 77.49 dollars including a }\3.99 \text{ shipping charges}\\
\\
\text{Given that each shirt cost }\$12.25 \text{, so the cost of x shirts would be}\\
=12.25\times x=12.25x\\
\\
\text{hence the equation that represents this situation is:}\\
\\
\text{Total cost of x shirts at a rate of 12.25 dollars each + Shipping charges}=\$77.49\\
\\
\Rightarrow 12.25x+3.99=77.49$

Hence the equation that can be used to find x is:

12.25 x + 3.99= 77.49

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Step-by-step explanation:

1) Data given and notation

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$s=1.1$ represent the standard deviation for the sample

$n=10$ sample size

$\mu_o =48$ represent the value that we want to test

$\alpha=0.05$ represent the significance level for the hypothesis test.

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$p_v$ represent the p value for the test (variable of interest)

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t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

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$t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349$

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