The fastest way to find the missing endpoint is to determine from the known endpoint to the midpoint and then performing the same transformation on the midpoint.
I'm going to try to let you answer this yourself so you can learn for yourself ok. :3
40% of 60 is 24
To convert from percent to decimal, divide the percent without the percent symbol by 100.
so, 40% = 40/100 = 0.4
40% 60 is just 0.4*60 = 24
Perpendicular equation: y=-1/5x + 6
52/8 is 6.5 which is 6.5 days 15-6.5 is 8.5 and 8.5 • 8 is 68. 68+52 is the same as 15•8 so i’m pretty sure the answer is 68