5x + x2 + 8y - 2x + 3x2

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?