A Brief History of Time written by Stephen Hawking has an ISBN of 978-055338016a, where a is the check number. What is the check number? A) 2
B) 3
C) 8
D) 7

what

11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2