Math Problem Statement

Find the value of: a) 2x when x = 5 b) 4y when y = -3 c) 3z when z = 1.2

Solution

The image contains three simple algebraic expressions to evaluate:

  1. 2x2x when x=5x = 5
  2. 4y4y when y=3y = -3
  3. 3z3z when z=1.2z = 1.2

Let's solve each of them:

a) 2x2x when x=5x = 5

2x=2×5=102x = 2 \times 5 = 10

b) 4y4y when y=3y = -3

4y=4×(3)=124y = 4 \times (-3) = -12

c) 3z3z when z=1.2z = 1.2

3z=3×1.2=3.63z = 3 \times 1.2 = 3.6

So, the results are:

  • a) 10
  • b) -12
  • c) 3.6

Would you like more details or have any other questions?

Here are 5 related questions:

  1. How do you evaluate expressions with multiple variables?
  2. How would the result change if xx was negative in part a)?
  3. What happens when multiplying by fractions in algebraic expressions?
  4. How does the distributive property affect simple algebraic calculations?
  5. Can you explain how to solve two-variable expressions like 2x+3y2x + 3y?

Tip: Always follow the order of operations (PEMDAS) when evaluating expressions involving more than one operation.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Expressions

Formulas

Multiplication of constants and variables: ax where a is a constant and x is a variable

Theorems

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Suitable Grade Level

Grades 6-8