Answer:
27
Step-by-step explanation:
Answer:
Step-by-step explanation:
we have

This is a compound inequality
Remember that
A compound inequality i can divide in a system of two inequalities
so
-----> inequality A
---> inequality B
step 1
Solve the inequality A

Multiply by -1 both sides



Divide by 5 both sides

Rewrite

The solution of the inequality A is the interval ----> (-3.2,∞)
step 2
Solve the inequality B

Multiply by -1 both sides



Divide by 5 both sides

The solution of the inequality B is the interval ----> (-∞, 10)
step 3
Find the solution of the compound inequality
(-3.2,∞) ∩ (-∞, 10)=(-3.2,10)
All real numbers greater than -3.2 and less than 10
The graph in the attached figure
The answer to #9 is 2.16%
Because the student scored 73/100 on the first test, their current average is 73%.
To calculate the avergae with the next test score, you add both percentages the student gets together and then divide by 2.
79 = (73 + x) / 2
Multiply by 2 on both sides
158 = 73 + x
Subtract 73 on both sides
x = 85
So the student needs to get at least an 85/100 on the next test to maintain a 79 average.