Find the number of permutations of the first 8 letters of the alphabet taking four letters at a time.

a. 1680

b. 56

c. 6720

d. 109

The ratio of the lengths of the radil of two spheres is 5 : 8 what is the ratio of the surface area of the smaller sphere to the surface area of the larger sphere

The expression below is the factorization of what trinomial? (5x + 6) (3x - 2)

Can someone show me two answers for y=4x+4

What is the answer to this problem? 8/2 (2+2) =

What multiplied by 8 plus 1 divided by 5 equals 5?

Two sides of an obtuse triangle measure 12 inches and 14 inches. The longest side measures 14 inches. What is the greatest possible whole-number length of the unknown side?

4z to the second power = 144

Lyle has 7/10 as many stamps as jeremy. If Jeremy has 140 stamps. How many more stamps does he have than lyle?

Simplify so that there are only positive exponents (3^9/3^-5)

The mean length of 7 books is 258 pages. the longest book has 294 pages. what is the mean length of the other 6 books