SAT Subject Test Mathematics Level 1

The quadrilateral’s area,   then,   is  6   +   30  =   36

19 . C
Apply the inside function first:

Then    apply   the outside function    to  the result:

20 . E

Put much    more    simply, what    the question    is  asking  is: At  what    point   does

cost    equal   revenue?    In  algebraic   terms,  for what    value   of  x   does    C   equal

R?

21 . A

Mark    up  the figure. The squares are identical,  so  AD  =   DG  and triangle    ADG

is  isosceles.  That    makes   the measure of  ∠DGA     75  degrees,   and the

measure of  ∠ADG    is  therefore   180°    –   75° –   75° =   30  degrees.    Now you

know    every   angle   in  the figure: