Problem 86 - Introductory Algebra for College Students

Question

Write a problem that can be solved by finding the sum of at least three numbers, some positive and some negative. Then explain how to solve the problem.

Step-by-Step Solution

Answer

In the end, you have $8.

Step 1: Create a Problem Scenario

Let's create a problem: For instance, you have $5 in your pocket. You found $10 on the street and later, you spent $7 on a meal. How much money do you have now?

Step 2: Identify the Numbers

The amount of money you initially have ($5) is positive, the money found ($10) is also positive and the money spent on a meal (-$7) is negative.

Step 3: Add together positive and negative numbers

When you add together positive and negative numbers, the negative number actually subtracts from the total. So it is equivalent to: $5 + $10 - $7.

Step 4: Find the sum

Now, just add and subtract the numbers: $5 + $10 = $15. Then, subtract $7 from $15. That leaves you with $15 - $7 = $8.