The answer is 64. Length times width times height.
No, because the sum of the total angle measure (or whatever it is called) is 720°, but those numbers only add up to 710°
Answer:

Step-by-step explanation:
In left small right triangle: we have the square of left side = 5^2 + y^2 = 25 + y^2
In right small right triangle: we have the square of right side = 8^2 + y^2 = 64 + y^2
In the large right triangle, we have (25 + y^2) + (64 + y^2) = (5 + 8)^2
89 + 2y^2 = 13^2 = 169
2y^2 = 169 - 89 = 80
y = 80/2 = 40
so

The answers are A and E.
The factors are (2x +9)(2x-9). If you solve each one by equaling each one to zero. You will get:
2x+9=0 2x-9=0
x=-9/2 x=9/2
360/6=60 - that’s angle 1
60/2=30 - that’s angle 2
30+90=120
180-120=60
Angle 3 is 60