Exponents, Order of Operation, Substitution and Distributive

Which expression is equivalent to
3x + 3 + 6x – 2? 

• 9x + 1
• 10x
• 12x - 2

Which expression is equivalent to
4x + 3y + 7x – 2y? 

• 7x + 5y
• 11x + y
• 12xy

Which expression is equivalent to
 6(x + 3y + 5)? 

• 54xy
• 24xy + 30
• 6x + 3y + 5
• 6x + 18y + 30

Which expression is equivalent to 6(5x + 7y)? 

• 11x + 13y
• 30x + 7y
• 30x + 42y

Which expression is equivalent to  4 (2x - 3)? 

• 2x - 12
• 6x + 1
• 8x - 3
• 8x -12

Which expression is equivalent to 4 (x - 4) ? 

• 4x - 16
• 4x + 16
• 4x - 4
• 4x - 8

Which expression is equivalent to
4.2 (2k + 12) + 3k? 

• 11.4k + 50.4
• 11.4k + 12
• 9.2k + 12

Which expression is equivalent to
 16 + d + d + d? 

• 3d³ + 16
• 3 (d x 16)
• 3d + 16
• d³ + 16

Raymond wrote the equation below to show that a ball rolls y feet in x seconds if it rolls 3 feet each second.
y = 3x
How many feet does the ball roll in 7 seconds? 

• 4
• 10
• 14
• 21

The expression 3n + 4.5 can be used to find the total cost, in dollars, to buy n pens. What is the total cost to buy 5 pens? 

• $12.50
• $22.50
• $25.50
• $37.50