Keystone Algebra I

Hank counted the number of scratches on cars of different ages. Hank then created a scatter plot showing the relationship between the age of a car (x) and the number of scratches found on the car (y). Based on the line of best fit, which is most likely the number of scratches that could be found on a car that is 30 years old?

• 30

• 74

• 87

• 100

A number pattern in shown. The pattern continues. What is the difference between the last number in row 5 and the first number in row 5?

• 12

• 15

• 43

• 9

Write an equation that can be used to find d, the difference between the last number and the first number for any row r.

• d = 3(r - 1)

• d = 3r - 1

• d = 3 - 3r

• d = 1 - 3r

• 1¹⁰
• 1²⁶
• z¹⁰
• z²⁶

Which region in the graph shown represents the solution to the following system of linear inequalities?
2x - y > 6
3y ≤ x - 6

• Region A

• Region B

• Region C

• Region D

Which inequality is graphed below? 

• x < -4

• x ≤ -4

• x > -4

• x ≥ -4

What is the slope of this line?

• Undefined

• Negative

• Positive

• Zero

Find the perimeter of a rectangle with length (x-5) and width (3x+1).

• 8x-8

• 4x-4

• 8x+8

• 4x+12

Simplify: (3x² + 2x - 8) - (-x² + 6x + 4)

• 2x² + 8x - 4

• 2x² + 8x - 12

• 4x² + 8x - 4

• 4x² - 4x - 12