A bag contains 5 blue buttons and 8 green. How many red buttons should be added so that the probability of drawing a green button is 40%?

Can someone answer this question? : )

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

If i purchase a product for $79.99 and two accessories for 9.99 and 7.00 how much will i owe after taxes applies 8.75%