A mean of 150 and a standard deviation of 25. What percentage can be expected to be between 100 and 150

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 : /

Full year - williamshow many square inches are in 60 square feet? 5 square inches72 square inches720 square inche8.640 square inches

7x^2-9x+5=0 find the discriminant and number of real solutions