Answer:
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.