Simplifying Expressions using Substitution

Find the value of 4a + 1 when a = 6

• 47

• 11

• 1

• 25

Answer explanation

it's 4 x 6 = 24 24 + 1= 25

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6

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

Answer explanation

positive 2 subtract 7 is going to be -5

Substitute then evaluate for: 8a - c if a = 2 , c = 4

• 12

• 6

• 0

• 20

Answer explanation

8 x 2 = 16 then 16 - 4 = 12

Find the value of 3b + c + d if b = 3, c = 4, d = 6

• 16

• 43

• 10

• 19

Answer explanation

3 x 3 = 9 9 + 4 = 13 and 13 + 6 = 19

Tags

CCSS.7.NS.A.3

Find the value of mp - 2p when m = -5 and p = - 8

• 56

• 50

• -24

• -56

Answer explanation

-5 x -8 = 40 then -2 x (-8) =16 finally 40 + 16 = 56

Tags

CCSS.7.NS.A.3

 $\sqrt{64}\ +\frac{4\left(a\right)}{f}\ if\ \ a\ =5\ and\ f=2$  

• 12.5

• 30

• 18

• 10

Answer explanation

sq. root of 64 is 8;  4 x 5 = 20,  20 divided by 2 is 10 then 8 + 10 = 18

Evaluate 5g - j if g =24 and j = -72

• -43

• 452

• 192

• 48

Answer explanation

5 x 24 = 120 then 120 -72 = 48

Tags

CCSS.7.NS.A.3

Evaluate w² - y if w = 9 and y = -17

• 64

• 98

• 1

• 35

Answer explanation

9 squared is 9 x 9 = 81; 81 - (-17) = 81 + 17 = 98 (remember minus a negative becomes a positive.)

Evaluate (y - x)³ if x = 15 ; y = 21

• 36

• 46,656

• 128

• 216

Answer explanation

21 - 15 = 6, then 6 x 6 x 6 = 216

Evaluate 6 + (r + s)² if r=13 ; s =2

• 21

• 32

• 231

• 225

Answer explanation

13 + 2 = 15; 15 squared is 15 x 15 = 225 then 225 + 6 = 231