Exploring Substitution in Expressions

What is algebraic substitution?

• Replacing a letter with a number in an expression

• Multiplying a number by a letter in an expression

• Replacing a number with a letter in an expression

• Adding a number to a letter in an expression

In the expression 3x + 1, if x = 2, what is the first step to solve it?

• Add 3 and 2

• Subtract 1 from 3

• Multiply 3 by 2

• Add 2 and 1

What does PEMDAS stand for?

• Parentheses, Exponents, Multiplication, Division, Subtraction, Addition

• Parentheses, Exponents, Multiplication, Addition, Division, Subtraction

• Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

• Parentheses, Exponents, Division, Multiplication, Addition, Subtraction

If n = -5, what is the value of n + 7?

• 12

• -2

• -12

• 2

What is the result of 3x - 2 when x = 5?

• 13

• 8

• 15

• 10

Evaluate N^2 + N for N = -4.

• 20

• -20

• -12

• 12

In the expression ABC, if A = -3, B = 2, and C = 5, what is the value?

• -10

• 30

• 10

• -30

What is the value of M / -5 + N if M = -15 and N = 1/2?

• 2.5

• 3.5

• -2.5

• -3.5

Which expression has the least value when x = 50?

• x / 2

• x - 100

• 3x + 5

• 2x + 10

If the expression 5x + 2.50 gives the total cost of buying x books, what is the total cost for 7 books?

• $37.50

• $35.00

• $32.50

• $30.00