Question

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

The amount left after spending $18 is$32.

Step-by-step solution

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.

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 $50-5=45$dollars in it.

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,

$\begin{array}{l}50-d\\ =50-18\\ =32\end{array}$

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