idk if you seen this but I try this
The equation to find the volume of a cylinder is
(pi)(r^2)(H)
we have the volume and radius
78.5 = (3.14)(2.5^2)(H)
78.5 = 3.14 * 6.25 * H
78.5 = 19.625H
/19.625 /19.625
4=H
The height of the cylinder is 4 meters
Answer: 2
Each time x increases by 2, the outputs are multiplied by 4 (eg: 3 to 12 is times 4, or 12 to 48 is times 4)
Take the square root of 4 to get 2. So each time x increases by 1, y is doubled
x = 0, y = 3
x = 1, y = 6 <<-- y is doubled
x = 2, y = 12 <<-- y is doubled
and so on
There are many strategies that can be used it really depends on what kind of questions you're answering.
The correct answer is 7x^2