y=-.156(30)+13.348

y = -.156(30) + 13.348 is our problem.

First we multiply -.156 * 30

$${\mathtt{\,-\,}}\left({\mathtt{0.156}}{\mathtt{\,\times\,}}{\mathtt{30}}\right) = {\mathtt{\,-\,}}{\frac{{\mathtt{117}}}{{\mathtt{25}}}} = -{\mathtt{4.68}}$$

Then we add 13.348 to that product and the sum is our answer.