Ted weighs twice as much as julie. mike weighs three times as much as julie. together, ted, mike, and julie weigh 210 lbs. what is the weight of each person?

X-weigh of Ted
y-weigh of Julie
z-weigh of Mike

x=2y
z=3y
x+y+z=210lbs

2y+y+3y=210
6y=210 /:6
y=35 lbs
x=2y=2*35=70 lbs
z=3y=3*35=105 lbs

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.

A