10ft squared
I think because 5 times 4 is 20 so 20 divided by 2 is 10 dividing braces of triangle
Volume of a sphere with radius of 70 feet is:

where r is that radius
Because we need quarter sized tank of that radius we need to divide formula for volume by 4
Than we get:

V = 359188,76
Rounded:
V = 359189
Answer: the answer is C because it asking does those coordinates pass thru the origin of 0,0
Step-by-step explanation:
From the origin you have to go 3 right put a dot and seven down put a dot, 13 down and one right ? Not sure