which system of equations has infinitely many solutions?
a)6x + 3y = 12
3x + y = 9
b)2x + 3y = 6
4x + y = 8
c)12x +9y = 6
4x + 3y = 6
d)5x + 10y = 20
2x+4y=8

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 size of the matrix resulting from

Which of those sequences is a geometric sequence