Kora calculated the area of a trapezoid using the formula A = atb x h, where a and b are the lengths of the bases, and h is the height. What is the area of a trapezoid when
a = 3, b = 7, and h= 5?

HELP

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.

3/8