X = cost of 1 sweat shirt
3x = 45
x = 15
5x = 5(15) = 75
It would cost $75. Hope this helps!
<h3>
<u>Answer:</u></h3>

<h3>
<u>Step-by-step explanation:</u></h3>
In the given parallelogram we can see that , <B is 5x° and <C is equal to 2x + 12°.
And these two are co - interior angles . And sum of co - interior angles is 180°.
Hence , here

<h3>
<u>Hence the value of x is 24°</u><u>.</u></h3>

The answer is x equals the square root of y+1/4