What is the curcumfrence of a circle if the diamter is 10

What is the y-intercept of the line given by the equation

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.