If a sample of radioactive material has only 12.5% of the original radioactive parent material, how many half-lives have passed? a. 3 b. 5 c. 6.25 d. 12.5

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Pleting the square f the given find the x-intercepts of the parabola with vertex (-5,13) and y-intercept (0, 12). write your answer in this form: (14,.99). if necessary, round to the nearest hundredth. *- h enter the correct answer, de verter, and ametry 00000 done doo