Find the mistake

3 (x-6) + (4x+12) - 6x=

3x-9+4x+12-6x=

(3x+4x-6x) + (-9+12) =

x+3

There are 3.5 times as many cats as there are dogs. If there are 28 dogs, how many cats are there?

You own 100 shares of xyz common stock. XYZ quarterly dividend is $1.00 per share. What is the dividend check you can expect to receive for this year?

Flip a coin 30 times. Find the empirical probability of getting a tail. Does it match the theoretical of 1/2?

Sarah is going to invest $7,300 and leave it in an account for 11 years. Assuming the interest is compounded daily, what interest rate, to the nearest tenth of a percent, would be required in order for Sarah to end up with $12,800

Artist 1 album sold 0.32 million more copies than Artist 2. The number of Artist 3 albums sold was 0.39 million less than twice the number of Artist 2 sales. The thre recording artists sold a total of 5.21 million albums.

Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per minute and Gear Q makes 40 revolutions per minute.

A triangle with vertices (0, 1), (4, 1), and (1, 5) is reflected across the x-axis. What are the new vertices of the reflected triangle?

Using only whole numbers Nikki wrote as many multiplication equations as she could with 12 as the product what where her equations

The price of an item is $12.25. You give the cashier a $10 and a $5 bill. What is the change?

In a group of 50 people 28% of them has flue shots done. What is the probability to choose from this group 15 people that didn't have flue shot.