Someone me with these three problems, i really need to get my grade up

81=16x²+24x+9

72=8(2x²+3x)

9=2x²+3x

0=2x²+3x-9

0=(2x-3)(x+3)

X=3/2 or -3

18=36x²+12x+1

0=36x²+12x-17

x=(-12±√(144-4(36)(-17))/2(36)

X=0.54 or 0.874

28=25x²+40x+16

0=25x²+40x-12

X=(-40±√(40²-4(25)(-12))/2(25)

X=-1.858 or 0.258

answer with step-by-step explanation:

a. ∠j is supplementary to ∠k - true:

(opposite angles of a trapezoid are supplementary which means that they add up to 180 degrees)

b. kl is parallel to jm - true:

(opposite sides are parallel to each other in a trapezoid)

c. jk is perpendicular to kl - false:

(clearly, jk does not make a right angle with kl)

d. jk is parallel to lm - false:

(jk and lm are two lines opposite in direction to each other so they cannot be parallel)

e. ∠j is congruent to ∠m - true:

(the angles on each side of the base are congruent)

f. ∠j is congruent to ∠k - false:

(the angles on the same side but opposite side of the base are not congruent)

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,