Operations with Rational Numbers

The video tutorial explains how 7th grade students at Mathvillie Middle School are selling t-shirts as a fundraiser. The t-shirts cost $3 each to make and are sold for $10 each. The tutorial demonstrates how to calculate the profit from selling 150 t-shirts using the order of operations (PEMDAS). It involves replacing the variable x with 150, performing multiplication, and then addition and subtraction to find the final profit of $1,050. The lesson concludes with a summary of solving real-world math problems involving rational numbers.

What is the cost to produce each t-shirt for the fundraiser?

• $10

• $7

• $5

• $3

If the t-shirts are sold for $10 each, what is the selling price of 150 t-shirts?

• $1,200

• $1,050

• $1,500

• $1,000

What is the result of multiplying -3 and 150 in the profit calculation?

• -150

• -4500

• -300

• -450

What is the final profit if 150 t-shirts are sold?

• $1,050

• $1,500

• $1,200

• $1,000

Why is the final profit positive in the calculation?

• Because the selling price is higher than the cost price

• Because the cost price is higher than the selling price

• Because the numbers are added

• Because the numbers are multiplied