Which number has the same value as 20 tens?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?