It is angle 4 because they make 90 degrees together
Set it up like a regular equation. I used:

As you can see, however, I inserted the "less than" symbol rather than the equal sign because values greater than a certain value can also equal "x". Solve it like a normal equation and you will arrive at:
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This means that, as long as x is greater than 45, "6x" will be greater than "3x+135". Thus, if you bring 46 students, the Science Center will cost less.
Answer:
the answer for A is 27 and B is 36 and C is 82
Answer:
(h,k) shows the coordintes of the turning point.