Help answer this question for 20 points.

D semi-sphere with diameter 10

Step-by-step explanation:

Rotating this along line m will give us a semi-sphere with diameter 10 ( radius 5)

It will be half of a ball

D

Step-by-step explanation:

When we rotate this around the line m, we will get something that looks like half of a sphere, which is also called a semisphere. So, eliminate answers A, B, and E.

Now, we look at the radius. When we rotate the shape, the surface looks like a circle. The radius doesn't change, though; it is still 5. This means that the diameter, which is 2 times the radius, is 5 * 2 = 10 units.

Thus, the answer is D.

Hope this helps!

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m