What is the value of x?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.

Javier bought a painting for $150. each year, the painting's value increases by a factor of 1.15. which expression gives the painting's value after 77 years?