One endpoint at 1,3 and the midpoint at 3,5
Your answer would be to as two to each the x and y of the midpoint. so 5,7
Answer:

Step-by-step explanation:
We are to factorize the expression
completely. To do this, we will apply the expression below;
The expression can be rewritten as 
To factorize the expression, we need to first factorize
first

The we will make
the subject of the formula as shown;




This last result gives the expansion of the expression
Answer:
27 years old
Step-by-step explanation:
Let Alvin's age be x and Elga's age is y:
y - x = 15
x + y = 27
2y = 42 (use elimination method)
y = 21
x = 6 (plug it back into either equation)
Therefore Alvin is 6 and Elga is 27
Answer:
Step-by-step explanation:







Answer:
12 feet
Step-by-step explanation:
Given: length = 15 feet, width = L x 80%
Unknown: width = ?
width = L x 80%
w = (15ft) x 80% or (15ft) x .80
w = 12 ft