What construction does the image below demonstrate?

a an equilateral triangle circumscribed about a circle
b an equilateral triangle inscribed in a circle
c the circumcenter of an equilateral triangle
d the incenter of an equilateral triangle

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account