Carnegie Writing and Solving Equations

What is the first step (after setting up your workspace) in solving this equation:
5x + 7 = 12

• Divide by 5
• Subtract 5
• Multiply by 7
• Subtract 7

Solve:

• x=4
• x=4/3
• x=-4
• x=1

Solve for x.
3x + 2 = 6x - 7

• x = 9
• x = 3
• x = -3
• x = 7

Solve for x. 
5x - 10 = x + 6

• No solution
• x = 1
• x = 2
• x = 4

-14+6b+7-2b=1+5b

• no solution
• -8
• 45
• -35

4x - 9x + 3 = -32

• -35/13
• 7
• -7
• -29/5

Write an expression:
Jan has $45 and earns $10 for each hour of babysitting for her clients

• 10x - 45
• 45x - 10
• 10x + 45
• 45x + 10

Write an expression for the number of envelopes left to stuff:
Grady stuffs envelopes for corporate mail-outs after school.  Today's mail-out is for 2000 envelopes. He can stuff 15 envelopes per minute.

• 2000 - 15x
• 15x + 2000
• 15 - 2000x
• 2000x + 15

Downloading Music
Chris is comparing two music downloading websites.  The first site charges a $15 membership fee and then charges $0.50 per song.  The second website has no membership fee, but they charge $0.80 per song.
What equation could be used to find the number of songs where the two sites charge the same amount?

• 15x + 0.50 = 0.80x
• 15 + 50x = 0.80x
• 15 + 0.50x = 0.80x
• 15.50 = 0.80x

Downloading Music
Chris is comparing two music downloading websites.  The first site charges a $15 membership fee and then charges $0.50 per song.  The second website has no membership fee, but they charge $0.80 per song.
What inequality can be used to represent the situation where the first site becomes the better deal?

• 15x + 0.50 < 0.80x
• 15 + 50x > 0.80x
• 15 + 0.50x < 0.80x
• 15.50 > 0.80x