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Algebra Strategies Drill 1: No Calculator Section

Work these algebra questions, without your calculator, using Plugging In or Plugging In the Answers.
Answers and explanations can be found on this page.

5 .The  length  of  a   certain rectangle   is  twice   the width.  If  the area    of  the rectangle   is  128,

what    is  the length  of  the rectangle?

A) 4

B) 8

C) 16

D) 21

10 .If  xy  <   0,  which   of  the following   must    be  true?

I. x    +   y   =   0

II. 2 y –   2x  <   0

III. x^2    +   y^2     >   0

A) I    only

B) III  only

C) I    and III

D) II   and III

13 .If      =   2 , what    is  the value   of  x   ?

A) 4

B) 16

C) 16

D) 32

15 .If  y   =   3x  and x   and y   are both    integers,   which   of  the following   is  equivalent  to  9x  +   3x+ 1   ?

A) y^3

B) 3 y  +   3

C) y(y  +   3)

D) y^2  +   3