21.When the angle of elevation to the Sun is 69°, a tower casts a shadow on the ground that is 64.3 feet long. Use the information in the table to determine the approximate length of the shadow cast by the tower when the angle of elevation to the Sun is 65º. 66.2 ft 52.9 ft 54.5 ft 78.1 ft

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

a and c

step-by-step explanation: