PLEASE HELP ASAP ON GEOMETRY HW : The point (7, 4) lies on a circle centered at the origin. Write the equation of the circle and state the radius.

3(10x-y)-5(x-y^2) need this solved asap

Find the arc length parameter along the given curve from the point where tequals=0 by evaluating the integral s(t)equals=integral from 0 to t startabsolutevalue bold v left parenthesis tau right parenthesis endabsolutevalue d tau∫0tv(τ) dτ. then find the length of the indicated portion of the curve r(t)equals=1010cosine tcost iplus+1010sine tsint jplus+88t k, where 0less than or equals≤tless than or equals≤startfraction pi over 3 endfraction π 3.

Simplify using positive exponents only.