15 less than half a number

75,000 live bacteria are present in a culture in a flask. When an antibiotic is added to the culture, the number of live bacteria is reduced by half every four hours. Approximately how many hours have passed when there are 2000 bacteria left alive?

50% of all cakes are party cakes. 1/5 were fruit. the rest were sponge, what is the percentage of sponge cakes?

How much more is 4/6 Than 5/6

In a group of 8 boys and 10 girls, 5 children are to be selected. In how many different ways can they be selected such that at least two boys should be there

The mass of the sun is 1.989x10^30 kilograms. The mass of the earth is 5.98x10^24 kilograms. About how many times bigger is the sun than the earth?

Wich equation show you how to find 16-9

What is the greatest common factor of 42, 126, and 210? F. 2 G. 6 H. 14 J. 21 K. 42

A cash prize of $3,400 is to be awarded at a fundraiser. If 1,700 tickets are sold at $5 each, find the expected value.

The initial cost to rent a bike in hilton head is $4. Each hour the bike is rented costs $1.75. Vince is going to rent a bike and can spend at most $18.

3x/4-7/2=1/4 what does x equal