To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce -9 as well and sum (Inside, Outside) to equal 8. For this problem, those two numbers are -1 and 9. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² + 8y - 9
y² + (-1 + 9)y + (-1 x 9)
(y - 1)(y + 9)

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

The slope-intercept equation for a line is y = mx + b where m is the slope and b is the y-intercept of the line. From the graph, you can see that the y-intercept (the y-value from the point where the line crosses the y-axis) is 3. The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, 7) and (2, -1) so the slope becomes:

Plugging these values into the slope-intercept equation:

y = -2x + 3

The volume of a cube is height x length x width:

v = h x l x w
v = 8 x 8 x 5
v = 320

The formula for area is πr²:

a = πr²
a = π(4²)
a = 16π