One winter night the temperature fell 15 degrees between midnight and 5 am. By 9 am, the temperature had doubled from what it was at 5 am. By noon, it had risen another 10 degrees to 32 degrees. What was the temperature at midnight?

in 10 minutes a heart beats 700 time how many minutes will a heart beat 140 times? At what rate can a heart beat?

Find the inverse 2^x+4

The sales tax on a $20 hammer is 7 percent, or $1.40. why is this tax a bigger burden for josh, who has a $15,000 income, than for aaron, who has a $150,000 income?

Bonnie has 24 wood beads and 30 glass beads. She wants each necklace she makes to have the same number of wood beads and the same number of glass beads. What is the greatest number of necklaces she can make if all the beads are used.

Last year, William made $620 babysitting. This year, he made 340% more money than he did last year. How much money did William make this year?

Can you make a triangle with the numbers 2,4,3

A person who weighs 100 pounds on Earth weighs 16.6lbs on the moon. Which variable is the independent variable

A tub of water is emptied at a rate of 3 gallons per minute. The equation y - 12 = - 3 (x - 1) models the amount of water remaining, where x is time (in minutes) and y is the amount of water left (in gallons).

Solve. If there are X teams in a sports league and all the teams play each other twice, a total of N (x) gamers are played, where N (x) = x^2-x. A soccer league has 10 teams, each of which plays the others twice.

Jake has piece of yarn that is 4 feet long. Blair has a piece of yarn that is 4 inches long. Who has the longer piece of yarn?