Why was change needed or necessary in the mid 1800's

Find each unit rate. a pump moves 42 gal in 7 mins

A square has a perimeter of 38 inches. We want to know the length of each side. Choose the best model for this problem. side length side length peri meter peri peri peri.

Round 7931 to the nearest thousand, hundreds, tens,

A 6 inch personal pizza has 590 calories, with 240 of those from fat. A 14 inch pizza is cut into 8 slices. Estimate the number of calories in one slice of a 14 inch pizza.

1,170,000,000 in scientific notation

How do I simplify 9/243

How far does Gerry live from school

Percent sales tax: 7% price before tax: $250 price with tax:

Can you show the work to 156 divide by 11

Which expression is equivalent to a + (c + 7) ? 7 a c a minus (c + 7) (c + 7) minus a (a + c) + 7