Which of the following is an exponential equation?

a.
3x + 2 = 23

b.
5 ‒ x2 = 4

c.
3x + 2 = 23

d.
7 ‒ 0.5x = 2x

B
it is the only one with an exponent

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.