The variable x represents the number of long-sleeve shirts nancy bought and the variable y represents the number of short-sleeve shirts she bought.

nancy bought 531 shirts for her business. she bought 2 times as many short-sleeve shirts as long-sleeve shirts.

how many of each type of shirt did she buy?

which system of equations models this problem?

{x+y=531y=2x

{x−y=531y=2x

{x+2y=531y=2x

{x+y=2y=531x

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?