Divide each term in the y column by 2 to go from this list {8, 2, 0, 2, 8} to this list {4, 1, 0, 1, 4}
This list {4, 1, 0, 1, 4} is a bunch of perfect squares so it suggests that y = x^2
However we must double the values to get back to the original list. So the rule is y = 2*x^2
A given term in a PG =a₁rⁿ⁻¹
Let' calculate the 1st term a₁, knowing a term & the common factor/ratio
a₄ = 1/2 so 1/2 = a₁(1/2)³
1/2 = a₁/8 and a₁ = 4
Now calculate a₉ =a₁.r⁸
a₉ = 4.(1/2)⁸ and a₉ = 1/64
Use the vertical line test to answer this. Draw a vertical line thru the graph at any x value for which there is a graph. If the vertical line crosses the graph exactly once, you've got yourself a function; otherwise, you don't.
what do you mean by two points???? You are going to have to provide a picture of the graph. Unless you mean (-,+)
Cos(37°) = 1/x
x = 1/cos(37°)
x = 1.25
answer: 1.25