Look at picture. Angle AEC is congruent to angle BDC because right angles are congruent. Angle ECA is congruent to angle DCB because vertical angles are congruent. to prove that triangle AEC ~ triangle BDC, we use AA postulate. The distance represented by x is __ ft. (Simplify your answer.)

x = 240 ft

Step-by-step explanation:

20/80 = 60/x

20x = 2400

x = 240 ft

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

the correct answer is a.) bc< mn 5 stars if this you : )

step-by-step explanation: