Some please help me please I need help I promise I will mark you brainliest

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

This figure consists of a rectangle and semicircle. what is the perimeter of this figure use 3.14 for pi 60.84m 72.84m 79.68m 98.52m

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone