3x - y - 1 = 0 what does this graph look like

What is the approximate circumference of the circle shown below?

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation