Which expression is equivalent to 13 - (-21) ?

Find the product of 5/12 and 3/8. express your answer in simplest form.

50% of what number is 140

How many of the first 999 Fibonacci numbers are odd?

Pat is 20 years older than his son Patrick. In 6 years Pat will be twice as old as Patrick. How old are they now?

Find the approximate mean absolute deviation for this list of numbers. [Note: Type your answer as a decimal number, rounded to the nearest tenth.] 55, 35, 27, 63, 49, 22, 71

The O'Malley family is driving cross-country to see their cousins. So far, they have traveled 275 miles. This is 1/5 of the way to their cousins' house. How far do the O'Malleys live from their cousins?

a sun in a distance galaxy has an estimated mass of 1.61244 * 10 ^32 kg and the earth has a mass of 5.972 * 10^24 kg, how many earths would it take to equal the mass of the sun?

Why did the ant run across the cracker box

the expression 6x + 15 represents the total cost of a bicycle rental. when danny rents a bike for 2 hours, the total cost of his rental is $27. What does the coefficient 6 represent?

Bonnie uses of a cup of sugar in each cupcake. If she is making 9 cupcakes, how much sugar will Bonnie need?