Quiz Review(1/28) Writing and Evaluating Expressions

Quiz Review(1/28) Writing and Evaluating Expressions

Evaluating Expressions

• "Plug In" or substitute a number in for that variable

• Example: Evaluate when 3 +a when a=10

• After substituting the new expressions would be 3 + 10

• The value of the expression would be 13.

Writing Expressions

• Taking verbal or written phrases and turning them into algebraic expressions.

• Pick a variable and figure out the math operation.

• Example: " five more than a number"

• a +5

Multiple Choice

Write an algebraic expression:

42 less than a number x

• 42 - x

• x - 42

Multiple Choice

Which expression shows the difference of 12 and x?

• 12x

• 12-x

• 12+x

Multiple Choice

Perry has 17 fewer baseball cards than Pete.
If b represents the number of cards Pete has, write an expression for how many baseball cards Perry has.

• b + 17
• b -17
• 17 - b
• 17 + b

Multiple Choice

Write an algebraic expression for the following: 8 more than f

• 8 - f
• 8 = f
• f + 8
• 8f

Multiple Choice

Evaluate 4a  if a=5

• 45
• 9
• 20

Multiple Choice

Evaluate the expression when x=4

 $\frac{32}{x}$ 

• 4

• 2

• 8

• 32

Multiple Choice

What is the value of the expression, if p = 22?
p + 22

• 144
• 66
• 22
• 44

Multiple Choice

Evaluate when x = 8:
2x + x - 10

• 34
• 22
• 14
• 24

Multiple Choice

Evaluate 3x + 8   if x = 2

• 13
• 14
• 15
• 16