Answer:
at y = 18 units
Step-by-step explanation:
An arch has the equation y=-2/81x^2+18. Find it’s maximum height
This is a parabolic function
Maximum at the vertex
x = -0/(2*(2/81)) = 0
max at y = 18 units
Since this is this equation has an absolute value than anything in the absolute value is positive.
y=|4x+2|
y=|6x|
y=6x
C Any geometric shape with multiple sides
This could be a parallelogram, but it also could easily be an isosceles trapezoid. A trapezoid is a figure with only one pair of parallel sides. An isosceles trapezoid is a trapezoid where the non-parallel sides are the same length. It's similar to an isosceles triangle.
Because this could be an isosceles trapezoid, this means we don't have enough information. See the attached image below for an example.

integrate to get
![[ln|t|]^{3x}_x=ln|3x|-ln|x|=ln| \frac{3x}{x}| =ln |3|=ln(3)](https://tex.z-dn.net/?f=%5Bln%7Ct%7C%5D%5E%7B3x%7D_x%3Dln%7C3x%7C-ln%7Cx%7C%3Dln%7C%20%5Cfrac%7B3x%7D%7Bx%7D%7C%20%3Dln%20%7C3%7C%3Dln%283%29)
this only is true when x>0
when x turns negative, we get -ln(3) because of math