Les drew the number line shown to add 2.5 + (–25). He says the sum is 22.5.
2 answers:
Answer:
Choices aren't provided, but we can draw a number line.
The given sum is , which is basically, the sum of a positive and negative number.
We just need to draw a line and placed each number. Remember that negative numbers are placed at the left side of the zero, and positive numbers are placed at the right side of the zero.
The image attached shows the number line, where the right results is 22.5.
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We have to write the equation which represents Katya's earnings while tutoring and working in a book store is given as follows:
She makes $20 an hour while tutoring. Let's say she tutors for 'x' hours in a day. So, she will make dollars by tutoring in a day.
She makes $8.50 an hour while working in the bookstore. Let's say she works for 'y' hours in the bookstore in a day. She will make dollars by working in the bookstore.
Therefore, the equation representing her total amount of money that she makes from both the places is given by:
$(20x + 8.50 y)
Since, Tution for 16 weeks is $5,736. So the amount of tuition for each week is == 378.5 dollars
So, Katya needs to make 378.50 dollars a week.
Since, She worked for 21 hours in the book store, so she makes
dollars= 178.50 dollars a week from the bookstore
So, now she needs to make = 378.50 - 178.50 = $180 a week while tutoring
Since she makes 20 dollars an hour from tutoring.
She needs to tutor = =9 hours a week to make the rest of the tuition.
So, Katya has to work for 9 hours in tutoring.