Expressions Substitution

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

Evaluate 2r + 1      if   r = 3

• 6

• 5

• 7

• 8

Evaluate the expression for the given values. 5x - 3y + 2z

• 17

• 19

• 13

• 29

What is the value of 2a - 3b + 6 when a = 2 and b = -5?

Mathematical Equivalence

ON

Solve 4x + 3 when x = 6

• 13

• 12

• 25

• 27

Tags

TEKS 7.10A

Evaluate 8.7j – 9.8k when j = 7 and k = 4.

Mathematical Equivalence

ON

Answer explanation

Evaluate 8.7j – 9.8k when j = 7 and k = 4.

First, substitute for j and k:

8.7(7) - 9.8(4) then multiply.

60.9 - 39.2 and finally subtract

21.7

Tags

CCSS.MATH.CONTENT.7.EE.B.4.a

Evaluate the expression. Let g = 3 h = 9

4g + 2h + 4

Mathematical Equivalence

ON

Evaluate -2x  if     x = 10

• -8

• 20

• -20