Need with with 15 me i can’t afford a tutor and my parents are busy

How many $20 bills do you need to have to make $280

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

In what organelle does photosynthesis take place?