Hello :
<span>a reflection over the y-axis</span>
20.09 → only one with decimal in the hundreds, not tens
(5, 90)
You can solve both equations for y and then set equal to each other. Then use the quadratic equation to solve for x
<span>Because there are 20 coins plus four bars = 24 items to choose. You want to choose where to put the four bars, thus C(24,4). There are four bars, not five. Note that four bars divide the 20 coins into five sections. Five bars would divide it into six, but we only have five different kinds of coins to choose from.</span>
