8th Grade Flashcard - Nov. 8, 2024

Front

What is an algebraic expression?

Back

An algebraic expression is a mathematical phrase that can include numbers, variables, and operation symbols. It does not have an equality sign.

Front

How do you write an algebraic expression for 'nine more than three times a number'?

Back

The expression is 3x + 9, where x represents the number.

Front

What is the formula for the perimeter of a rectangle with length x and width 4?

Back

The perimeter P is given by the formula P = 2(length + width) = 2(x + 4) = 4x + 8.

Front

How do you set up an equation for a word problem involving multiple athletes' scores?

Back

Define variables for each athlete's score, write expressions based on the relationships described, and set up an equation that sums their scores to the total.

Front

If Jordan scored twice as many points as LeBron and Kobe scored fifteen points more than Jordan, how do you express their scores?

Back

Let LeBron's score be L. Then Jordan's score is 2L, and Kobe's score is 2L + 15.

Front

What is the total score equation for Jordan, LeBron, and Kobe if their total is 290 points?

Back

The equation is L + 2L + (2L + 15) = 290.

Front

How do you solve the equation L + 2L + (2L + 15) = 290 for L?

Back

Combine like terms to get 5L + 15 = 290, then subtract 15 from both sides and divide by 5.

Front

What is the value of y^2 - y when y = -2?

Back

Substituting -2 for y gives (-2)^2 - (-2) = 4 + 2 = 6.

Front

How do you evaluate the expression 2((x + z)/y) when x = -4, y = 3, z = -5?

Back

Substituting the values gives 2((-4 + -5)/3) = 2(-9/3) = 2(-3) = -6.

Front

What is the significance of declaring your answer in a word problem?

Back

Declaring your answer clearly indicates the final result and ensures that it directly addresses the question asked.