Need helpp fastt plss will give brainliest to who is correct plss helpp

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park what is the unit rate and what does it represent in the context of the situation?

Which of the following circles have their centers in the third quadrant? check all that apply.

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4