This is too big of a question for only 5 points
Answer:
The surface area of the structure is 
Step-by-step explanation:
we know that
The surface area of a sphere is equal to

In this problem we have
-----The radius is half the diameter
substitute


C, 60 hope this helps it helped me on my test
Answer:
27 1/2
Step-by-step explanation:
A delightful problem ! / / / a). The product of the slopes of two perpendicular lines is always -1. / / / b). Since one of the lines passes through the origin, the y-intercept of that one is zero. No matter what the y-intercept of the other one is, their product is zero. / / / Zero is greater than -1. The correct choice is (b).