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Math·Advanced Math·Nonlinear functions

easy

The relationship between the variables $x$ and $y$ is defined by an exponential equation. When $x=0$, the value of $y$ is $30$, and for every increase in the value of $x$ by $1$, the corresponding value of $y$ increases by $70\%$ of its previous value. Which equation represents this relationship?

A

$y=30(1.70{)}^x$

B

$y=30(1.07{)}^x$

C

$y=70(1.30{)}^x$

D

$y=70(1.03{)}^x$