The perimeter of the figure is given. Find the length of the indicated side.

7x+5

Step-by-step explanation:

Perimeter is the sum of all four sides

So take the total perimeter and subtract the two sides we know.

18x+6-4x+4

14x+10 is what's left. But remember that's the length of the TWO other sides.

So, divide that in half and you get 7x+5

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)