Deduce la ecuación de la circunferencia con centro en el origen con el radio dado a)r=1

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl

If value of cos330° is √3/2 then find tan165°.