the first one is all substitution.Originally Posted byxiaoz

so substitute 8 for n

and solve

number 2 asks you to solve for n, so lets do it...

use the distributive property

simplify

multiply both sides by n

subtract 180n from both sides

subtract

divide both sides by A-180

simplify

simplify

and thats what n equals. Substitute the given number for A (157.5)

and solve, this will give you the answer for a.ii