What is the area of a circle with a diameter of 8 cm? 256 cm^2
64 cm^2
8 cm^2
16 cm^2

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.