Refer to the figure to complete this proportion r/h = h/?

How can you construct perpendicular lines and prove theorems about perpendicular lines

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove