Question

The total cost, c, in dollars, of b bottles of water is c = 1.1b.

Answer 1

Since as b increases by 1, c increases by 1.1, the constant of proportionality is $\frac{1.1}{1}$ or 1.1

Answer 2

Answer: 1.1

Step-by-step explanation:

Given expression : c = 1.1b, where c= total cost of b bottles of water.

Two variables are proportional if there is always a constant ratio between them, and that ratio is called the constant of proportionality.

Here, if we divide c by b , we get

$\frac{c}{b}=\frac{1.1\ b}{b}=\frac{1.1}{1}$

Thus the constant ratio of total cost 'c' to number of bottles'b' is  1.1 :1.

Thus, the constant of proportionality here= 1.1.