Answer the questions below.Note that a change can be an increase or a decrease.For an increase, use a positive number.For a decrease, use a negative number.(a)Laura pumped 42 gallons of water out of her pool. This was done over a period of 6 minutes at a constant rate. What was the change in the amount of water in the pool each minute?7gallons(b)Carlos added 8 fish to his pond each day for 72 days. What was the total change in the number of fish in the pond?576fish

(a)Laura pumped 42 gallons of water out of her pool. This was done over a period of 6 minutes at a constant rate. What was the change in the amount of water in the pool each minute?gallons

Two pools are being filled with water. To start, the first pool had 992 liters of water and the second pool was empty. Water is being added to the first pool at a rate of 16 liters per minute. Water is being added to the second pool at a rate of 48 liters per minute.Let x be the number of minutes water has been added.(a)For each pool, write an expression for the amount of water in the pool after x minutes.Amountofwaterinthefirstpool(in=liters)Amountofwaterinthesecondpool(in=liters)(b)Write an equation to show when the two pools would have the same amount of water.

At a factory workers are draining a large vat containing water. The water is being drained at a constant rate. The table below shows the amount of water in the vat after different amounts of time.Time (minutes) 15 20 25 30Water (liters) 620 560 500 440Answer the following questions.(a)Choose the statement that best describes how the time and the amount of water in the vat are related. Then give the value requested.As time increases, the amount of water in the vat decreases.At what rate is the amount of water in the vat decreasing?litersperminuteAs time increases, the amount of water in the vat increases.At what rate is the amount of water in the vat increasing?litersperminute(b)How much water was in the vat when the workers started draining it?liters

A scientist counts 80 fishes in a pond. He marks them all with a UV pen. The next day he counts 60 fish, 24 of which have already been marked with his UV pen. Use this information to estimate the total fish in the pond:

Answer the questions below.Note that a change can be an increase or a decrease.For an increase, use a positive number.For a decrease, use a negative number.(a)Jenny owns 9 shares of a certain stock. Yesterday the total value of her shares went down by 90 dollars. What was the change in value for each share?dollars(b)A private club grew by 7 members each week for 21 weeks. What was the total change in the club's size?members