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Work out the value of the following expressions when a = 3, b = 4 and c = 5.
3ab

• 10
• 12
• 15
• 36

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a

• 5
• 6
• 8
• 10

Evaluate -2x  if     x = 10

• -8
• 20
• -20

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
a + b   

• 7
• 8
• 9
• 6

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a

• 5
• 6
• 8
• 10

Work out the value of the expression when x = 3, y = – 2 and z = – 4.
y + x – z     

• -5
• -3
• 3
• 5

Evaluate 2r + 1      if   r = 3

• 6
• 5
• 7
• 8

Evaluate 4y  if       y = 3

• 7
• 12

3x + 8   if x = 2

• 13
• 14
• 15
• 16

Evaluate expression if a=3

18 ÷ 2a

• 3

• 6

• 27

• 9