Add and subtract the values. Express your answer in scientific notation. (6.15x 10^8)-(2.5x 10^7)+(3.4 x 10^9)
6.24 x 10^8
7.05x 10^8
3.99 x 10^9
4.04 x 10^9

correct answer is b. 27/8

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.