What is equivlent to 15x-20

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

The box plot shows the number of raisins found in sample boxes from brand c and from brand d. each box weighs the same. what could you infer by comparing the range of the data for each brand? a) a box of raisins from either brand has about 28 raisins. b) the number of raisins in boxes from brand c varies more than boxes from brand d. c) the number of raisins in boxes from brand d varies more than boxes from brand c. d) the number of raisins in boxes from either brand varies about the same.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9