Answer:

Step-by-step explanation:
Given

Required
What value of c makes the mean = 10
Mean is calculated as

In this case;
Mean = 10 and n = 4;
So, we have:


Multiply both sides by 4


Solve for c


Answer:
I believe the answer would be d
Step-by-step explanation:
First year to find how much one pencil cost cost then multiply A number
0.717, 0.718, 0.720, 0.820......