Evaluating Expressions with Letters as Numbers

Evaluate -5a if a = -4

• -20

• 20

• -9

• 9

Evaluate 9a if a = -3

• 27

• -27

• -3

• 3

Evaluate -b if b = 12

• 12

• -12

For a monthly family cookout, David buys 3 packages of hot dogs and 4 packages of hamburger patties. Hot dog packages each contain x hot dogs. Hamburger packages each contain y hamburger patties. Complete the expressions for the total number of hot dogs and hamburger patties David buys for 6 cookouts. 6( ​ (a)   x + ​ (b)   y)

​ (c)   x + ​ (d)   y

• 3

• 4

• 18

• 24

• 7

Evaluate a + (-b) if a = 15 and b = 6

• 21

• -9

• 9

• 80

• -24

• 24

Evaluate a + (-b) if a = -7 and b = -3

• -4

• -10

• 10

• 21

in the term, "4k," what is the mathematical term for the number 4? Select ALL that apply

• variable

• coefficient

• factor

• exponent

Evaluate the following expression when a = 2 and b = 5: 4a³ - 8b

• -12

• -8

• -24

• 12

Evaluate the following expression when c= -7 and d = 4:

8/d - 12c - d⁴

• A. 20

• B. -170

• C. 256

• D. 170