Dan paid 7.5% sales tax when he bought a new smart watch the sales tax was $30.75 what was the total cost of the smart watch including tax?

Which ordered pair is a solution of the equation? 2x+3y=10

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?

The length of the line segment ac is 8x-9 what is the value of x