Expressions and equations 8th grade

Given abcd ac=38 and ae=3x+4 find the value of x

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

He trapezoid is composed of a rectangle and two triangles. what is the area of the rectangle? what is the total area of the triangles? what is the area of the trapezoid? ? a) 42 cm2; 27 cm2; 69 cm 2 b) 54 cm2; 27 cm2; 81 cm 2 c) 108 cm2; 27 cm2; 135 cm 2 d) 108 cm2; 13.5 cm2; 121.5 cm 2