Answer:
13.
Step-by-step explanation:
x+x+5=21
2x+5=21
2x=16
x=8
Answer:
6 plus or minus square root of 37/2
Step-by-step explanation:
Is the quadratic formula allowed or no?
Answer:
Step-by-step explanation:
5x = 30
If there are 5 students in a row, find the number of rows given that the number of total students is 30.
Here 'x' represents the number of row
Answer:

Step-by-step explanation:
Given




Required

This is calculated as:

Since it is a selection without replacement, the computation is:

So, we have:



