Answer:
the answer is D.126
Step-by-step explanation:
Use the formula A=2(wl+hl+hw)
X = 10
if we say 1/2 base = <em>a</em>
a² = 13² - 12²
a² = 25
a = √25
a = 5
if 1/2 base = 5 then x = a × 2
hence X = 5 × 2 = 10
7^15
7^5^3 = 7^(5*3) = 7^15
