Erica had 6 coins in her coin collection. she goes to a coin show and buys some coins. how many dose she have now?

1 answer:

3 0

Since, it is not given how many coins did Erica buy at the coin show, so, we can suppose that Erica bought "n" coins from the coin show.

Now, we know that Erica already had 6 coins in her coin collection before she went to the coin show and bought the "n" coins.

Therefore, the total number of coins that Erica will have in her possession after buying "n" coins from the coin show will be 6+n.

You might be interested in

If you were to pull colored marbles out of the bag (one at a time, and putting the marble back each time) for 500 tries, approxi

shepuryov [24]

Answer:

We need to know the other marbles in the bag and how many there are of each.

5 0

3 years ago

Find the inverse function for

kifflom [539]

$\bf \stackrel{f(x)}{y}=\sqrt{2x-6}\qquad \qquad \stackrel{f^{-1}(x)}{y}=\cfrac{x^2+6}{2}$

that is correct hmmmm, yes, I think the restriction is also correct, it has to be x > 0, because, the domain on the original, has a restriction of x⩾3, otherwise the radicand turns negative.

now, the graph of that original function is a parabola sideways opening to the right, if you include both sides of the vertex of the parabola, it will not pass the vertical-line-test and not be a function, but if you restrict it to only positive roots, so it'll only be on the 1st quadrant, then it functions ok.

that means, the range of the original function, has to stick to only 0 or positive root values, now, recall that the range of the original is the domain of the inverse. Therefore, the domain of the inverse, will have to stick to only 0 or positive values, since it's bound to the same restriction as the original's range.

notice the picture below of both, the dashed section is the positive range for each, if you include it, the original will fail the vertical-line-test, and the inverse will fail the horizontal-line-test.

recall that for a function to have an inverse, they both must pass the vertical and horizontal line test, or be a one-to-one functions.