Scientists estimate there are 70,000 species insects in each acre of the Amazon Rainforest. How many species are there in 100 acres? *

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?