7th 4-1 Write and Evaluate Expressions

Evaluate 3.6x+4.5y when x=3 and y=7.

Evaluate 5.5r−8.35s when r=12 and s=4.

Write an expression that represents the weight of an object that weighs 12 pounds and increases by 0.5 pound per month m.

• 12 + 0.5m

• 12m + 0.5

• 12 - 0.5m

• 12m - 0.5

Evaluate the expression for the given value of the variable.

4c−3

c=−2

Evaluate the expression for the given value of the variable.

(1/3)x + 5

x= −6

Evaluate the expression for the given value of the variables.

0.3k−4m

k=20 and m=−2

Evaluate the expression for the given value of the variable.

−50 + (5/13)p

p=−26

Which expression can be used to determine the total weight of b baseballs that weigh 5.25 ounces each and s softballs that weigh 6.5 ounces​ each?

• 5.25b−6.5s

• 5.25b+6.5s

• 11.75(b+​s)

• 6.5b+5.25s

Water evaporates at a rate of 1.5 ounces per day from a container that holds 34 ounces when full. Which expression represents the amount of water remaining in the container after d​ days?

• 1.5+34d

• 32.5d

• 34−1.5d

• 34+1.5d

Amanda bought g gallons of paint for​ $16.55 per gallon and t pints of paint thinner for​ $5.97 per pint.

• 16.55g•5.97t

• 16.55t+5.97g

• 16.55g+5.97t

• 16.55t•5.97g