Pls help finding X
thank you if u do (Pls do not spam i have this in my test so need to learn)

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

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