What is 550,000 written in scientific notation

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

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°