A rental company charges $15 plus $4 per hour to rent a bicycle. If Margie does not want to spend more than $27 for her rental,
write and solve an inequality to find how many hours she can rent the
bicycle and not spend more than $27. Interpret the solution.
PLEASE ANSWER FAST I WILL GIVE BRAINLIEST

To find the extreme values of a function f(x.y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x,y)=xy

This is different from the first one can someone me

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)