Rob invests $8,468 in a retirement account with a fixed annual interest rate of 7% compounded 4 times per year. What will the account balance be after 13 years? A) $18,357.25
B) $20,872.31
C) $18,167.50
D) $19,473.00

we need the options

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.