Discover Questions

How would I sketch f(x,y) = x^2 + 9y^2 on the xy plane? I know it is a circle.? Could someone please help me find the LCD of this rational expression as well as the solution? 4/(x+1)+1/x=15/(2x)? What is the reason behind simplifying a fraction? please explain, thank you? Average weight is 182.9 pounds and standard deviation is 40.8 pounds, what is the probability a person will be less than 174 pounds? Can any one graph y=-2x+4 using x and y intercept?