How do you get the area of quarter of a circle

Im 10 years old and my sister is 4 years younger than me. 60 years later how old is my sister?

The mass of 5m^3 of copper is 44800kg. Work out the density of copper.

Mr polandski is adding food coloring to water to create his own paint colors. he has 5 1/3 cups of water to create a color he needs 2/3 cup of water how many paint colors in all can mr. polanski create if he uses all the cups of water he has

A child is sitting in a tree 8 ft off the ground. A raccoon is sighted 6.5 ft away from the base of the tree. What is the angle of depression from where the child is sitting to the raccoon? Round to the nearest hundredth.

If anna have 3 eggs and josh gives her another 3. how many eggs anna haves?

A researcher measured the heights of forty high-school students. The measurements are recorded here. Heights (in inches) 58 59 60 60 60 61 61 61 61 62 62 62 62 62 62 63 63 63 64 65 67 67 68 68 68 68 69 69 70 70 70 71 71 71 71 71 72 73 74 76 If

Sally's bicycle tire is 52 inches in circumference. Number of Revolutions Distance Covered. 1 inches 3 inches 12 inches 27 inches 146 inches

Lower quartile of 6 8 10 12 14 15 15 20

Oswald has £6 he buys some cans of drink at 85p each and has 5p left over how many cans of drink did he buy

Lisa's store collects 5% sales tax on every item sold if if she caused if she collected $22. In sales tax what was the cost of the items her store sold