Write 7,500,000,000 in scientific notation. 0.75 × 10 10 7.5 × 10 -9 7.5 × 10 9 7500 × 10 6

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

Pls! does anybody know a shortcut for answering these types of questions in the future?

Given: ∆mop p∆mop =12+4 3 m∠p = 90°, m∠m = 60° find: mp, mo