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