MULTI-STEP PROBLEM You are buying a tank for three fish. You have a
flame angel that is 3.5 inches long, a yellow sailfin tang that is 5.5 inches
long, and a coral beauty that is 3 inches long. The area (in square inches)
of water surface the fish need is given by the expression 12f where fis the
sum of the lengths (in inches) of all the fish in the tank.
a. What is the total length of the three fish?

a) 12 inches

b) 144 square inches

Step-by-step explanation:

The complete question has 2 parts to

a. What is the total length of the three fish?

b. How many square inches of water surface do the fish need?

Lets

a)

The total length of three fish are the sum of all the individual fishes' length.

1st is 3.5 in

2nd is 5.5 inches

3rd is 3 inches

Sum is:

3.5 + 5.5 + 3 = 12 inches

f is 12

b)

The expression   gives the total area. We already found f = 12, now the area is:

Area = 12f

Area = 12 * 12

Area = 144 sq. in.

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold