How much is 10 + (-10)

What is the equation in point slope form of the line that passes through the point (-1, -3) and has a slope of 4? y-1=4(x-3) or y+3=4(x+1)

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me