The ratio of boys to girls in a classroom is 2:1. If there are 18 boys, how many girls are there?

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?