What is “twice a number is more than the sum of that number and 9” written in equation form?

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

Pls! does anybody know a shortcut for answering these types of questions in the future?

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