4. dan and laura had to pay to sign up for swim lessons, and then they paid a certain amount per lesson. dan
took 4 lessons and spent $100. laura took 8 lessons and spent $200. if their friend mitch spent $440, how many
lessons did he take?

Mitch has taken 17 complete lesson and 60% of one last lesson.  

Solution:

Dan and Laura needs to pay certain amount for swimming lessons.

Dan took four lessons and paid $ 100

Laura took 8 lessons and paid $ 200.

Need to calculate number of lessons taken by Mitch when amount paid by Mitch = $440.

Let’s first calculate price of one lesson.

For 4 lessons of Dan, payment = $100

So for 1 lesson of Dan, payment

For 8 lessons of Laura, payment made = $200

So for 1 lesson of laura, payment made =

So clearly cost of 1 lesson = $ 25.

So number of lessons taken by Mitch = Amount spent / cost of 1 lesson

So Mitch has taken 17 complete lesson and 60% of one last lesson.

an altitude of 15,000 feet

step-by-step explanation: