18 = 3 + 5x for x.

A. 1
B. 2
C. 3
D. 4

C. 3

Step-by-step explanation:

subtract 3 from both sides

15 = 5x

Divide by 5 on both sides

3 = x

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.