WILL MARK AS BRAINLIEST
Factor completely:
1) -9x4+1296
2) 3x6-1029y9
3) 5a5b10+60a3b5x2+180ax4
4) 9x2y2-27x2y-72y2+216y

Solve by completing the square.
5)x2+8x= -20

6) An archway will be constructed over a walkway. A piece of wood will need to be curved to match a parabola. If the focal point is (2,5) and the directrix is y = -7. Find the equation of the parabola.

take the top number and divide it by a the bottom number

step-by-step explanation:

1/2 1 divied by 2 = .5

300pi

step-by-step explanation:

answer: yard ramps with a level off platform are typically 36 feet long. truck, rather than at an angle, enabling access to those pallets at the very back of the truck. if you are using your yard ramp to convert a loading dock into a drive-in door, we even at 60 inches (5 feet) high and a 30 foot ramp, the slope of the ramp will be less

step-by-step explanation:

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d