I want to put a pool in my backyard. The total area for my backyard is 7x^2+26x-48. I want to keep an area of grass that is 4x^2+3x-12. What are the possible dimensions of the pool?

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

How do you solving the solution of each system using elimination?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /