Have u been doing anything with Pythagorean theorem? i belive that is what u have to do
#8 you do 360= 112+136+x... then you solve for x. X=112. Now you divide this by two since it is an inscribed angle. For #9 I have this very simplified work in the picture. Sorry I did not do #10
1 km=1093.61yards
6 km= 6*1093.61yards
6 km= 6561.66yards
Answer= 6561.66 yards
120% of 590=1.20*590=708.
For x% of a number y, the answer is x/100*y.
You can solve this in two ways.
1. Graphical. Plot the graph for x between -5 and 1 (see attachement).
The vertex of the graph is the peak of the curve, which has the coordinates x=-2, y=-9.
2. Analytical. Calculate the derivative of the function f(x)

Solve the equation:

will give the solution x=-2.
Replace x=-2 in the f(x) function and you'll get the value of y:

You get the same answer: x=-2, y=-9
So the answer is
<span>B. (-2, -9)</span>