Answers and Explanations
PRACTICE TEST 4
1 . A
First, eliminate choice (E), since it is a linear equation, not a quadratic
equation. Then you could attempt to factor each equation to determine
the roots, then check the sum and the product of these roots. However,
you may recall that in a quadratic equation in the form ax^2 + bx + c, the
sum of the roots is and the product of the roots is In choice (A),
and
2 . D
Draw a picture of the problem situation:
As you can see from the drawing, this is a right triangle, where x
represents the horizontal distance of the boat to the lighthouse. Use the