The lines kx + 2y = -7 and y = 2x - 5 are perpendicular to each other. Find the value of k.

k=1

Step-by-step explanation:

1. find the negative reciprocal of the slope of y=2x-5 because that is the slope perpendicular to it.

m=2 ; negative reciprocal is 1/-2

2. isolate y in the first equation

y= kx/-2 + 7/-2

3. the only value for k that would make their slopes the same would be 1

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

v = 1/3 a^2h

step-by-step explanation:

if the height is 57.7cm and the height of the slant edge is 18.2cm, then the volume is 1/3 a^2h.