Question

literacy
an online bookstore sells all paperback books for x dollars each. aidan bought 7 paperback books and spent $3.95 on shipping. nina bought 11 paperback books and spent $5.25 on shipping.
what expression represents the total amount that aidan and nina spent?

1. underline the question that you need to answer.
2. what does it mean when a problem asks for an expression?
3. circle the part of the problem that represents the cost of a book.
4. how can you find the cost of nina’s books?

□ the problem states that nina’s books cost $11.
□ add 11 and x.
□ multiply 11 and x.
□ add 11 and 5.25.

Explanation:

Step1: Calculate Aidan's total cost

Aidan's book cost: $7x$, plus shipping: $7x + 3.95$

Step2: Calculate Nina's total cost

Nina's book cost: $11x$, plus shipping: $11x + 5.25$

Step3: Sum both total costs

$(7x + 3.95) + (11x + 5.25) = 18x + 9.20$

Step4: Answer sub-question 4

Each book costs $x$, 11 books cost $11 \times x$.

Answer:

1. Underlined question: "What expression represents the total amount that Aidan and Nina spent?"
2. An expression is a mathematical phrase using numbers, variables, and operations to represent a quantity, without an equals sign.
3. Circled part: "x dollars each"
4. Multiply 11 and x.

Total cost expression: $18x + 9.20$