Add parentheses to the expression so that its value is 6: 3 + 9 ÷ 9 - 6 a. (3 + 9) ÷ 9 - 6 b. 3 + (9 ÷ 9) - 6 c. 3 + 9 ÷ (9 - 6) d. no parentheses are needed. explain why we need parentheses and when we know to use them.

What function has a range {yly< 5}? question on picture above^

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. after about how many years will the value of cate's stock be about $2000

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters