Hi there!

We can begin by making each fraction have a common denominator:
If we make each have a common denominator of ab, we get:

Simplify:

Multiply both sides by ab:

Move b to the opposite side:

Factor out b:

Divide by (ac - 1):

He is not making a valid inference because he is assuming the student populations interest based on a small part/ group of the student population, his class.
Answer:
infinite solutions
Step-by-step explanation:
Multiply the first equation by 2 so we don't have fractions.
x = 1/2y - 3 becomes 2x = y - 6
Now substitute the second equation into the y-value of the new equation
2x = (2x + 6) - 6
2x = 2x
x can equal anything. this means there are infinite solutions
Answer:
A≈3418.05
Step-by-step explanation:
2π(16)(18)+2π(16)^2=
3418.05280711