Astudent saves $20 per week from his part-time job. how much will he have saved in 21 weeks?

$420

Step-by-step explanation:

Given that the students save$20 every week this can be written as;

1 week= $20 saved

For 21 weeks, you perform multiplication

1w=$20

21weeks=?perform cross multiplication

21*20=$420

Step-by-step explanation:

You need to analize the information provided.

The amount of money the student saves in 1 week is: $20

You need to calculate the amount of money the student will have saved in 21 weeks.

 Therefore, in order to solve the exercise, you need to multiply the amount of money the student saves in 1 week by 21. The product obtained will be the amount of money the student will have saved in 21 weeks.

Then, you get:

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4