Answer:
16+2=18
18-3=15
2*3=6
Step-by-step explanation:
Ellipses, parabolas, and infinity. A parabola can be defined as the locus of points equidistant from a fixed point (called the focus) and a fixed line (called the directrix). But we know from projective geometry that parabolas and ellipses are essentially the same object.
When you "combine like terms", you are putting together terms that look similar. For example, 4n and n look similar, because they both have an "n". Imagine the n's are apples, and numbers without 'n' are oranges.
If you have 4 apples, and add 1 apple, you have 5 apples, or 5n.
If you have 6 oranges, and take away 2, you have 4 oranges. But, you can't put apples and oranges together, they are 2 different fruits.
So, you're left with 5n+4!