Homework 1.1 Variables and Expressions

Front

Evaluate the expression r - s for r = 6 and s = 5.

Back

1

Front

Write an expression for the number of hours Jim works overtime when he works h hours (overtime is more than 40 hours).

Back

h - 40

Front

Write an expression for Friday’s temperature if it was 20° warmer than Monday’s temperature t.

Back

t + 20

Front

Evaluate the expression sr for s = 5 and r = 6.

Back

30

Front

Write an algebraic expression for b less than 17 and provide a real-world situation.

Back

17 - b; For example, if you have 17 candies and you give b candies to your friend, you have 17 - b candies left.

Front

What is a variable in mathematics?

Back

A symbol used to represent an unknown value.

Front

What is an expression in mathematics?

Back

A combination of numbers, variables, and operators (like +, -, *, /) without an equality sign.

Front

What does it mean to evaluate an expression?

Back

To calculate the value of the expression by substituting variables with numbers.

Front

What is the difference between an equation and an expression?

Back

An equation has an equality sign (=), while an expression does not.

Front

What is the order of operations in mathematics?

Back

Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).