1/2÷3/4 what is the unit rate

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Write an inequality for this sentence the quotient of a number and -5 increased by 4 is at most 8

What is the expression equivalent to (3x^2-7)