The 1st period class of 28 students averaged 84% on math test. her 2nd period class of 24 students averaged 86%. what must her 3rd period class of 32 students average so that the three classes have a combined average of 80%?

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

Circle a has center of (2,3) and a radius of 5 and circle b has a center of (1,4) and a radius of 10. what steps will show that circle a is similar to circle b 1) dilate circle a by a scale factor of 2 2) translate circle a using the rule (x+1,y-1) 3) rotate circle a 180 degrees about the center 4) reflect circle a over the y-axis