writing equations and COP

The graph shows the water used while

children brush their teeth. What is the

rate of gallons used per minute?

• 10 gallons per minute

• 15 gallons per minute

• 35 gallons per minute

• 5 gallons per minute

• 4

• 1/4

• 0

• Not here

A plain cheese pizza costs $8. Each

additional topping that is added to the

pizza costs $0.50. Which of the following

could be used to determine, c , the cost

for a pizza with n number of toppings?

• c = 8 + 0.5 n

• c = 8 n + 0.5

• c = (8 + 0.5) n

• c = 8 + 0.5 + n

Which of the following represents the

constant of proportionality for the

relationship shown in the table above?

• 2

• 0.7

• 1.2

• 0.6

Which table(s) of data illustrate(s) a

constant rate of change?

• I and II

• II and III

• II only

• III only

A firefighter uses equipment that weighs

60 pounds. The firefighter weighs x

pounds. Which equation can be used to

find t , the total weight of both the

firefighter and his equipment in pounds?

• t = 60 x

• t = x + 60

• t = 60 − x

• t = x − 60

A pilot takes a taxi from the airport to a

hotel. The taxi driver charges a $2.50

initial charge plus $2.65 per mile. Which

equation can be used to find y, the total

cost of the trip, if x represents the

number of miles of the trip?

• y = 2.50x + 2.65

• y = 2.65(x + 2.50)

• y = 2.65x - 2.50y

• y = 2.65x + 2.50