Writing and Evaluting Expressions

Sophie pays m dollars to rent a car for the weekend. On the drive home, she buys $25 worth of gasoline. Her friend Melody pays for one-half the cost of the car rental only. Choose an expression you could use to determine how much Sophie spent.

• m+25

• 
  $m+25-\frac{1}{2}$

• 
  

  $\frac{1}{2}\left(m+25\right)$

• $\frac{1}{2}m+25$

Choose Yes or No to tell whether each situation can be represented by the expression 25.75x + 10.

Carol has $25.75. She earns $10 for each car she washes.

• yes

• no

Choose Yes or No to tell whether each situation can be represented by the expression 25.75x + 10.

Max has $10. He earns $25.75 for every lawn he mows

• yes

• no

Choose Yes or No to tell whether each situation can be represented by the expression 25.75x + 10.

Jin buys x postcards for $25.75 and x keychains for $10 each

• yes

• no

Angeline bought s yards of satin fabric priced at $8.09 per yard, and c yards of cotton fabric priced at $3.79 per yard. Use an expression to determine the amount that Angeline would spend in all if she bought 5 yards of satin fabric and 8 yards of cotton fabric. Enter your answer in the box.

Leon has a container filled with 450 grams of tea leaves. Each morning, he uses 3 grams to make a cup of tea.

Which expression can be used to represent the amount of tea leaves remaining after x days?

• 450 – 3x

• 450 + 3x

• 3 + 450x

• 3 – 450x

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.

Evaluate the expression for the given value of the variable.

4c−3

c=−2

An elevator began at an elevation of 85.5 feet and ascended at a rate of 2.75 feet per second. What was the elevation of the elevator after 8​ seconds?

• 107.5 ft

• 53.5 ft

• 74.75 ft

• 96.25