What is the equivalent property of 7(x+3)

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.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Solve the triangle. a = 21°, c = 105°, c = 5