Answer:
C) -0.828
Step-by-step explanation:
(I used a regression calculator)
Drawing a diagram to represent the information you've given, the only angle we are missing is B. We can find that by subtracting the two we're given from 180:
180 - 90 - 48.8 = 41.2
<em>m</em>∠<em>B</em> = 41.2°.
We can use the angles and the one side we're given to find the remaining sides. Since we do not know the length of the hypotenuse, AB, we cannot use sine or cosine. We must use tangent (the ratio for tangent is opposite/adjacent):

Multiply both sides by 1.6:

This is the length of side AC, which is opposite to angle B.
To find the length of AB we can use the Pythagorean Theorem:

The length of side AC, the hypotenuse, is 4 inches.
Since these are all like terms, you're essentially just adding and subtracting here.

Add
and
.

Then, subtract.

Your answer is
.
Count from the origin to the center of the parabola. You will notice that there are 4 units.
So, the axis of symmetry is the line x = 4. The equation x = 4 cuts the parabola exactly in half.