The science club sold 35 t-shirts last week and 28 t-shirts this week. what is the percentage of decrease in the number of t-shirts sold?

In order for us to know the answer, we just have to know what percent is 18 from 25, given that they sold 25 t shirts last week and only 18 t-shirts this week. So to know this, we simply divide 18 by 25 and we get 0.72 multiply this by 100 and it is 72%. To know the percentage of decrease, simply subtract 72% from 100% and we get 28%. Therefore, the percentage of decrease is 28%. Hope this answer helps.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0