If there is 16 boys in the classroom are 40% of the class, how many students are there in the class

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches. approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

On ryan's last social studies test there were two types of questions true/false worth 3 points each and multiple choice questions worth 4 points each