Hector and Linh are working individually on a problem involving the function f(x)=x2−5. On a domain where f is invertible, Hector says that f−1(4)=3, and Linh says that f−1(4)=−3.

Is Hector correct? Is Linh correct? Justify your answer.

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

so, converting firstly the mixed fractions to improper fractions and then "adding".