Big Ideas Algebra Final

Solve for the variable in the questions below:
1) 5 + x = 25

• x = 30
• x = 5
• x = 20
• x = -20

2x + 6 = 14

• x = 4
• x = 10
• x = -4
• x = 3

Write as an equation:
12 is 18 less than nine times a number

• 12= 18 -9x
• 9x -18 = 12
• 12 - 18 = 9x
• 9x - 12 = 18

If 10 students went to Starbucks and ordered their favorite food on one ticket.  The total bill is known as B.  Each student paid $9.45.  What is the equation that shows how they split the bill?

• $9.45/10 = B
• B x 10 = $9.45
• B/ 10 = $9.45
• B - 10 = $9.45

What is the error?
3x -9 = 36
     -9     -9
___________
3x      = 27
divide    divide
3             3
x = 9

• Nothing is wrong
• Did not divide by the correct coefficient
• Did not perform the correct inverse operation to isolate 3x
• Did not add correctly

Distribute:
4(x-9)

• 4x
• -36
• -4x +36
• 4x -36

Solve the equation below:

• k = 152
• k = 176
• k = 5
• k = 27

Solve the equation
3x = 27. 

• x = 24
• x = 81
• x = 9
• Why are there letters in math?!

What is the opposite operation of subtraction?

• Subtraction
• Multiplication
• Division
• Addition

What is the opposite operation of division?

• Division
• Multiplication
• Addition
• Subtraction