Each night Emily gets math problems for homework. This week she got 12 problems on Monday, 18 on Tuesday, 15 on Wednesday, 24 on Thursday, and 30 on Friday. What is the mean?

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.

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

Can someone me with these two circle theorem questions asap?