Use mental math to solve 9 - 7 > 9

The doubling time 0f a population of fruit flies is 8 hours. by what factor does the population increase in 24 hours? 1 week?

What is the area of 21.3

What is equivalent to 41/100

If A completes a particular work in 8 days and B the same work in 24 days. How many days will it take if they work together?

Jesse needs 18 cups of flour to make 78 pancakes. How many pancakes can Jesse make with 6 cups of flour?

What is the area of a triangle that has a base of 10 inches and a height of 7 inches

Research scientists need a certain type of bacteria to conduct an experiment. There are 100 bacteria in a certain culture. The culture grows at a rate of 70% daily. The scientists need at least 1,400 bacteria to conduct an experiment.

Round 0.584 to the nearest tenth

Emily purchased a couch, loveseat, in the chair for $2000. The Loveseat cost twice as much as the chair, and the couch cost $600 more than the love seat. Find the cost of the couch, loveseat, and chair.

x3 + 11x2 - 3x - 33 by grouping?