How to write numbers in standard form?

Solve the equation x^2-4x-21=0

Casey has 48 red peppers and 16 yellow peppers. If Casey wants to put the peppers into baskets so that each basket has the same number of red peppers and the same number of yellow peppers, what is the greatest number of baskets he can make?

Estimate the quotient 63.5 divided by 5

What's the rate of change of y=2x+6?

The question 10a^2bc+5abc-1

What is the unknown factor and quotient?

The octagon is a regular polygon. What is the measure of each interior angle in the polygolon

Adan drew two same size rectangles and divided them into the same number of equal parts. He shade 1/3 of one rectangle and 1/4 of other rectangles. What is the least number of parts into which both rectangles could be divided

0.12 or 1.2% which is greater

Your uncle Jim lives in England, where the current exchange rate is 1.64 US dollars for each British pound. Solve for the amount of your monthly bill, to the nearest hundredth, if you lived in England.