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Chapter 1: Q39. (page 7)

You can evaluate the expression 50-d to find the amount you have left on a \(50 gift card after you have spent d dollars. Find the amount left after you have spent \)18.

Short Answer

Expert verified

The amount left after spending $18 is$32.

Step by step solution

01

Step-1 – Apply the concept of Variable

In any expression or equation, the variable is an unknown quantity. It may be any alphabet or any special symbol.

02

Step-2 – Given expression to find the amount

The expression 50-d gives the amount left in a card after spending d dollars from it.

So, if you have spent $5, then the remaining amount in the card will be 50-5=45dollars in it.

03

Step-3 – Find the amount after spending $18

Initially there were $50 in the gift card.

And the expression that gives the remaining amount after spending the d dollars is given by 50-d.

So, to find the remaining amount after spending $18, substitute 18 for d in above expression and simplify further as shown below,

50鈭�d=50鈭�18=32

Thus, the amount left after you have spent $18 is $32.

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