Evaluate Expressions Substitution

Evaluate 2a + 4b 
if a = 10     and    b = 6

• 20

• 24

• 44

• 4

Evaluate -2x  if     x = 10

• -8

• 20

• -20

Evaluate 8a - b if a = 10 and b = 6

• 74

• 38

• 86

• 8106

6a - 3d
when a = 1, d = 2

• 3

• 12

• 1

• 0

Evaluate the expression. Let g = 3 h = 9

4g + 2h + 4

• 42

• 34

• 46

• 58

Substitute these values for B - A ; A = 7 , B = 2

Answer explanation

positive 2 subtract 7 is going to be -5

What is the variable in the expression y - 7

• 7

• y

• y-7

• There is not a variable

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

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

• 7

• 8

• 9

• 6