The last one would be the right one I believe
7% of 100= 0.07
$300x0.07=$21
$300 of 7% sales tax is $21
$300+$21=$321 total purchase
True, because it’s not certain it will be symmetrical.
Having a root, is the same as having an exponent of 1/2
√a³, becomes a^3/2
a^(3/2) - b^3 is your answer
hope this helps
