(74 + 78 + 70 + x) / 4 = 80
Divide each number by 4.
18.5 + 19.5 + 17.5 + x = 80
Add the numbers you know so far.
18.5 + 19.5 + 17.5 = 55.5
You need 24.5.
Now, since we divided all the others by 4, we have to multiply 24.5 by 4 to see what the exam score would be.
24.5 * 4 = 98.
To get an average of 80%, the student would need to get a 98 on their fourth exam.
Answer:
no solutions
Step-by-step explanation:
Simplify the equation 

Since

and

we have

Since
cannot be less than
this equation has no solutions.
Answer:
Option B is correct.
Step-by-step explanation:
We have been given four inequalities and a graph we need to tell which one of these inequalities matches the graph.
So, the graph of each inequality is attached in the attachment.
Graphs attached in sequence of the inequality.
Therefore, Option B is correct.
Answer:
The correct options are A ,C and F.
Step-by-step explanation:
The given expression is

Calculate the simplified form of given options.
A.

B.

C.

D.

E.

F.

Therefore correct options are A ,C and F.