Triangle abc is shown below: triangle abc is shown. a is at 2, 1. b is at negative 1, 4. c is at 3, 7. if triangle abc is reflected over the x-axis, which of the following shows the coordinates for point c'?
(−3, 7)

(3, 7)

(−3, −7)

(3, −7)

Reflecting across the Y axis would make all the points on the triangle the same distance from the Y axis, just on the opposite side.

Point B is at X = -1, so when reflected across the Y axis would be at X = 1

The Y value would remain the same.

The new location for B would be (1,4)

please add graph for next time could help more

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,