When i think of a number, double it and add three i get 11. what number did i think of

There are 5 people at a party. each person must shake hands once with every other person at the party. how many handshakes does it take to do this?

Juan was making a shelf for his bedroom. He had a wooden board that measures 7 1/3 feet. How much wood should he cut off his board if he needs 5 1/2 feet for the shelf.

Solve for the variable - 3x 4 > 5

Camila tiene $50 en su cuenta. Al final de cada semana toma $8. Miguel tiene $27 en su cuenta. Al final se cada semana agrega $4. Al cabo de cuentas semanas Camila y Miguel tendrán lo mismo en sus cuentas?.

A sphere of diameter D inches is cut by a plane which passes through its center. Find the area of the cross-section, leaving the answer in terms of π.

The circumference of the earth is approximately 24,901 miles. The circumference of the earth's moon is about 72.76% smaller than the earth's circumference. What is the approximate radius of the earth's moon? A. 1,079.55 miles B. 6,783.03 miles c.

In another project, researchers caught and tagged 85 sea lions in a bay. Later they caught and released 50 sea lions. Of those, 9 had tags. Estimate the sea lion population in the bay.

Rebecca knows there are 4 quarts in a gallon. She knows that a large drum holds 5 gallons. How many quarts will the drum hold?

5/8 9/16 1/4 3/8 from least to greatest

Sandy plays tennis once every 6 six days. Jim plays once every 8 eight days. If they both played tennis today, in how many days will they play on the same day again?