24/r=36/27 what is r? and one more w/0.16 = 6.25 what is w

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b