Variables and Algebraic Expressions

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Show your work for each problem.

1.
Which of the following is a variable?
1. a)
2. b)
3. c)
4. d)
2.
What does mean?
1. a)
2. b)
3. c)
4. d)
3.
Evaluate when .
4.
Evaluate when .
5.
Which expression means 'a number decreased by 4'?
1. a)
2. b)
3. c)
4. d)
6.
Evaluate when .
7.
Evaluate when and .
8.
Write an expression for: 'twice a number, plus three'
9.
In the expression , what is the coefficient of ?
1. a)
2. b)
3. c)
4. d)
10.
Evaluate when .
11.
A gym membership costs 25 euros per month plus a 50 euro joining fee. Write an expression for the total cost after months, then find the cost after 6 months.
12.
Evaluate when .
13.
Evaluate when .
14.
Which expression represents 'the quotient of a number and 5, increased by 2'?
1. a)
2. b)
3. c)
4. d)
15.
Evaluate when .