At the park there is a sandbox with a length of 10 feet and a width of 9 feet. what is the area of the sandbox?

If the measure of xyz is 81 what is the measure of yz

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.