In any ecosystem, the size of a population

A. always stays the same.

B. only depends on the population's reproductive rate.

c. may change over time.

D. only depends on the amount of resources available.

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How many of the numbers from 10 through 97 have the sum of their digits equal to a perfect square?

A train is traveling at a constant speed of 105 miles per hour. How many feet does it travel in 4 seconds? Remember that 1 mile is 5280 feet.

A box contains 5 blue chips and 11 red chips. a person selects two chips without replacement, find the probability of selecting 2 blue chips?

Water is pouring into a container at a rate given by ri = t^3 (gallons/hour), and water is pouring out of the same container at a rate given by ro (t) = e^t (gallons/hour).

A map of Colorado says that the scale is 1 inch to 20 miles or 1 inch to 1,267,200. Are these two ways of reporting the scale the same? Explain your reasoning.

Blank is 5 times as much as 27

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Simplify this expression. 5^6 : 5^4 A. 2 B. 5 C. 10 D. 25

Caitlin wants to read for 90 minutes so far she has read 30% of her how much more longer does she need to read

A family went to a baseball game. They parked the car in a parking lot which charged $20. The cost per ticket was $28. Write an equation for the total cost of going to the baseball game, where y is the total cost and x is the total number of people.