In this fraction, which number is the denominator? 1/15

A.
1

B.
15

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25