PLEASE HELP! WORTH 20 POINTS! WHOEVER GETS IT RIGHT GETS A

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.