(5 Points) 77 A gear with a radius of 8 centimeters is turning at 3 radians per sec. What is the linear speed at a point on the outer edge of the gear?​

Me. i can't figure out this question. give an explanation too. .

Urgent need asap △abc is similar to △xyz. also, side ab measures 6 cm, side bc measures 18 cm, and side xy measures 12 cm. what is the measure of side yz ? enter your answer in the box.

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.