7th Grade Math Mid-Year Review

Front

What is the formula to calculate Jerome's total earnings if he sells 'b' bikes?

Back

Total Earnings = 200 + 12b

Front

If Jerome wants to earn at least $400, what inequality represents the situation?

Back

200 + 12b ≥ 400

Front

How do you solve the inequality 200 + 12b ≥ 400 for 'b'?

Back

Subtract 200 from both sides: 12b ≥ 200; then divide by 12: b ≥ 16.67, so he needs to sell at least 17 bikes.

Front

What is the result of the expression -3 + 8?

Back

5

Front

What is the simplified form of the expression 3 - 2a + 3a + 5a?

Back

6a + 3

Front

What does it mean for two expressions to be equivalent?

Back

Two expressions are equivalent if they have the same value for all values of their variables.

Front

What is the equivalent expression for 3(–2x – 1)?

Back

-6x - 3

Front

How do you solve the equation x - 34 = -12?

Back

Add 34 to both sides: x = 22.

Front

What is the definition of a variable in algebra?

Back

A variable is a symbol (usually a letter) that represents an unknown value.

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal.