Help me simplify this question

If the value of cos330°is√3/2 then find cos 165°.

Which of the following parabolas opens up?

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.