80% of the 65 coffee mugs at Mike's Pancake House are dirty. How many dirty coffee mugs are there at the pancake house?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i