Olivia is making bead bracelets for her friends. She can make 3 bracelets in 15 minutes. Now find the constant of proportionality in terms of number of bracelets per minute.

Bring the fraction a/a-4 to a denominator of 16-a^2

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4? r^2. write your answer in scientific notation.

Find the area of the region between a regular hexagon with sides of 6" and its inscribed circle.