Answer:

Step-by-step explanation:
An easy way to get exponents done if you're dealing with a multiple of 10, is to count the number of 0's present.
Since there are 3 0's in 1000, 10*10*10 = 1000 which just so happens to be the exponent needed
The graph x2 only has 1 x-intercept, because it is directly on the origin.
The graph x2+2 is the parent function shifted up by 2 units. Since the lowest point is (0,2) and the graph points up, it has no x-intercepts.
If there is 4 thousands and 7 hundreds is 4,700
The area of the semicircle is 14.1372