Alisa is making a design for the bottom of a dress using trapezoid shapes cut from different colors of fabric. Each trapezoid has base lengths 5 inches and 10 inches and a height of 6 inches. How much fabric does she need for 4 trapezoids?

Well we are going to use the formula of a trapezoid.

What'd given is that two bases are 5 and 10 and the height is 6

add the two bases: 10 + 5 = 15 multiply it by 6 = 15 x 6 = 90 then divide by 2 = 45 since she is making 4 multiply it by 4,

45 x 4 = 180 fabric she needs.