Answer:
36
Step-by-step explanation:
Triangle FED and Triangle AEC are similar.
That means, the ratio of corresponding sides are equal. Thus we can say:

Also, since EC is 39 and D is the midpoint, ED and DC are half of that. Hence ED = 39/2 = 19.5
Now we can use the ratio to solve for AC:

Hence, AC = 36
Volume of a Rectangular Prism: V=lwh
l=50 cm
w= 30cm
h= 40 cm
Step 1: 50×30×40= 60,000
The volume of the tank is 60,000 cubic centimeters
The water reaches a height of 28 centimeters, or 2142.9 cubic centimeters per centimeter.
Step 2: 35× 2142.9= 75001.5 cubic centimeters
Step 3) 75001.5- 60,000= 15001.5 CUBIC CENTIMETERS ARE NEEDED TO FILL THE REST OF THE TANK TO A HEIGHT OF 35 CENTIMETERS
Hope this helps!
Common Denominators:
a.108
b.48
c.54
d.40
(1, 0) and (0, -2)
slope = (0 + 2)/(1 - 0) = 2/1 = 2
the slope is m = 2
the y intercept is b = -2
See you Need to round it so it is c=-4