exam Maths Puzzle Numerical Ability

I cant find a good example of how to graph a porabola in x-itercept and y-intercept form. Can you explain these to things better to me in note form pleas. It would really help me out in my math class. Thank you.

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exam Other Question

There are 400 seats in the theatre. Organizers want to make a profit of $2750 from ticket sales. Non students will pay $8, students $5. How many of each type of ticket will have to could you show me step by step how to do this problem:1/x^-4
Also could you tell me if this problem is right:5^-3*5^7=625
I know these are probably easy ones but I always second guess myself.
Thank you for your time.
Sincerely,JH