Introducing Algebraic Variables

Which expression represents 10 less than half the number, n? 

• 10 - 2n

• 10 - 1/2n

• 2n - 10

• 1/2n - 10

Which expression represents five times
the difference of a number, n and 3? 

• 5n - 3

• 5 ( n - 3 )

• 3 - 5n

• 5 - n - 3

Which phrase best describes this expression:   6.7 - 4c

• four times a
  number, c minus six and seven-tenths

• 4 times a number, c subtracted from six and seven-tenths

• a number, c minus the product of four and six and seven-tenths

• a number, c times the difference between
   4 and six and seven-tenths

What is the constant in the expression:
5x² - 3x³ +  2x + 4 ?

• 2

• 3

• 4

• 5

What is the coefficient of "x" in the expression: 
3w - x + 2y + z

• 1

• -1

• 2

• 3

In the expression 5(3y - 7) + 12, which describes (3y -7)? 

• a product of two factors

• a difference of two variables

• a difference of two terms

• a product of two terms

What are the terms in the expression
 8x - 3y + 7 ?

• 8, -3, 7

• x, y

• 8x, -3y, 7

• 8x, 3y, 7

How many terms are in the expression:
3a² ⋅ 2a - c + 7

• 2

• 3

• 4

• 5

Which expression represents half the sum of n and 7 ? 

• 1/2 n + 7

• 1/2 (n + 7)

• 1/2 n ÷ 7

• 1/2 + (n + 7)

Rachel bought "s" pairs of socks.  Steven bought 6 pairs of socks.  Emma bought twice as many socks as both Rachel and Steven.  Which expression represents how many socks Emma bought? 

• s + 6

• 2s + 6s

• 2(s + 6)

• s + 12