Answer:
The answer is 10
Step-by-step explanation:

In getting the x, you must first convert the said data in to a slope intercept form and the formula for it is y = mx+b so the slope is 7/16 while the y is 3.5. In that data its self you can came up with the equation of 3.5 = 7/16x + 0 and the value of X would be 8. I hope you are satisfied with my answer
X intercept- (0,250)
Y intercept- (0,100)
If you want me to explain I can!
Find the area of each face and add them all together, or since a cube has 6 faces, you can multiply the area of one face by 6.