Help pls please hmmm

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?

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.

What is the value of x? assume that the line is tangent to the circle.