What is the reciprocal of 2/3 ? how can you be sure it is the reciprocal?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

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

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.