The product of 3.4×10 to the -14th power and 1.8×10 to the 28th power

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?