Factor completely 5b2+20ab+15a2

Find dy/dx using implicit differentiation ln(20+e^xy)=y

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

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 : /