Answer:

Step-by-step explanation:
Given


Required
Determine the coordinate of the 4th point
From the given parameters, we can see that the rectangle is either horizontal or vertical.
This is because:

and

To calculate the fourth point, we simply make use of:
and 
Substitute 1.5 for x2 in 


Substitute -2 1/2 for y3 in 


Hence, the 4th point is:

Answer:
50.39
Step-by-step explanation:
40% of 35.99 aprox. equals 14.40. 35.99 + 14.40= 50.39
50 x 3/10 = 15
12 x 2/3 = 8
weight of 3rd bag =
15+8=23 lbs