Answers and Explanations

PRACTICE TEST 1

1 . A

You don’t   need    to  find    the value   of  a   to  answer  this    question.   It’s    more

direct  to  recognize   that    the denominator of  the expression  you’re  solving

for is  exactly twice   the left    side    of  the given   equation:

2 . C

To  find    the average of  four    expressions,    add them    up  and divide  by  4.  The

sum is  8x  +   4.  When    you divide  that    by  4,  you get  2 x    +    1.

3 .  A

To  solve   an  equation    with    the unknown in  an  exponent,   rewrite the

equation    so  that    both    sides   have    the same    base: