Is 6.6 a rational number

Noelle has 198 coins, all nickels and dimes. Noelle has 20 more nickels than dimes. How many of each coin does Noelle have?

1. Write the following statements with the factorial symbol. 1) 2 * 4 * 9 * ... * 20 2) 1 * 3 * 5 * ... * 19 2. Prove: 5! + 5 * 5! + 6 * 6! + 7 * 7! + ... + 99 * 99! = 100!

What is 2/3n - 2/3=n/6+4/3

How do u do long division

Come up with a scenario that explains why hours (hours for what?) goes down with time. It can be short, just a couple sentences or so.

Eugene typed 525 words in 15 minutes. At that rate, how many words would he type in 8 minutes?

Ling tried to evaluate the expression 15:5+7*5

What is the exact value of tan (-pi) ?

Which term describes the number of square units contained in the interior of a polygon? A. Perimeter B. Width C. Height D. Area

The sum of two numbers is 17 and their product is 70