12 i don't know how to set it up and i'm very confused

There are two things to solve for; the number of bicycles: b and tricycles: t. Solving for two things requires two equations. You are given enough information to set up:

an equation for number of cycles

b + t = 50

an equation for number of wheels

2b + 3t = 111

Now you can use substitution or elimination to solve for the first variable.

I'll use substitution.

b + t = 50 then b = 50 - t

So sub in (50 - t) for b in the second equation. This combines the two equations  into one and makes it in terms of only one variable.

2(50 - t)  + 3t = 111

100 - 2t + 3t = 111

100 + t = 111

t = 111 - 100

t = 11

Now use this in either of the equations to find the other variable, b.

11 + b = 50

b = 50 - 11

b = 39

slope is 35 and 20 miles is the y-intercept.

step-by-step explanation:

i believe it is 0.1m because the measurement of 30.4m limits how precise you can be

you can only be as precise as the least precise measurement