If you expand -9(-2x-3) you get 18x+27 (a minus times a minus is a positive) so the answer is A.
Problems a through c are asking you what the values would be at those values.
What will the value of be at ? Let's look at the graph.
It seems at , , meaning that
Let's do the same for the others.
At ,
At ,
For the last question, it is giving us the value and asking us which values would give us that.
At , .
*Note* this function is continuous to the right, meaning that there is another point where .
Hope this helps.
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The area of circle can be found using the formula πr² and since we know that semi circle is half the circle so its formula will be 1/2πr².
First we will find the radius.
20/2 = 10
Radius is 10.
A = 1/2(3.14)(10)²
A = 157
Hope this helps :)