You have a pile of 20 dimes and quarters which total $2.75. how many quarters do you have?

i have already tried to do this:
20 dimes = 2.00
3=0.75

$2.75

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial