simultaneous equations

Simplify by combining like terms: 10x^3 + 5x^2 – 2x + 1 – x^3 – 20x^2 – 2x – 1.

• -x^3 + 5x^2 – 4x

• 9x^3 – 5x^2 – 4x

• 9x^3 + 5x^2 – 4x

• 9x^3 – 5x^2 – 4x – 1

Simplify: x(x – 3) – (x^2 – 6) – (x^2 – 2x + 9).

• –(x^2 + x + 3)

• x^2 + x + 3

• x^2 – x – 15

• –x^2 – 5x + 3

If x = –3, y = 2, and z = 0, the value of xy + 8z – x is ......... .

• -3

• 3

• 1

• -1

What is the area of a trapezoid when h = 1, b1 = 14, and b2 = 8?(You may use the formula sheet)

• 22

• 11

• 3

• –3

The sum of a certain number and 6 is 20. Half that number is ?.

The number of men in an adult education course is one less than three times the number of women. If 39 people are taking the course, how many are women?

• 29

• 10

• 20

• cannot tell from the data given

Zeb and his friend Jon cleaned a yard for $80 total. If Zeb worked three times as many hours as Jon, how much of the money should Zeb get?

• $20

• $40

• $60

• $80

A seesaw is balanced when the force (weight) at one end times its distance from the fulcrum (pivot) equals the weight at the other end times its distance from the fulcrum. Marianne, who weighs 48 pounds, is sitting 5 feet from the pivot of a 9-foot seesaw. Her friend Jimmy joins her, but when he gets on, the seesaw is perfectly balanced in the air. How much does Jimmy weigh?

• 48 pounds

• 60 pounds

• 38.4 pounds

• 90 pounds

The formula for the following graph is

• y = 2x + 3

• 2y = 4x + 6

• 2x = y – 3

• All of these

Which of these equations is perpendicular to the line in the following graph?

• A

• B

• C

• D