Reciprocal: what to multiply a value by to get 1; also known as multiplicative inverse.
You seem to have gotten m∠2. Remember that ∠1 and ∠2 are alternate interior angles, meaning they're both equal. Since they gave you m∠1 as being 26°, you now know the measure of ∠2.
As for m∠3 and m∠4, If you look at ∠3 you'll see that it is complementary to ∠1 (They both add up to 90°), so if you subtract m∠1 from 90° you'll have found m∠3. You find m∠4 the same way.
Hope this helped.
2.5% per year multiplay by 5 equals 12.5% then multiple 2500 with 12.5 equals 312.5
