Answer :
Given:
Calories she burns per minute = 10.6 calories per minute
Calories she burns before she swims = 15 calories
If she needs to burn 205.8 calories, the equation to find out how many minutes she must swim is:
205.8 = 10.6M + 15
Where M represents the number of minutes.
Let's solve for M.
205.8 = 10.6M + 15
Subtract 15 from both sides:
205.8 - 15 = 10.6M + 15 - 15
190.8 = 10.6M
Divide both sides by 10.6
[tex]\begin{gathered} \frac{190.8}{10.6}=\frac{10.6M}{10.6} \\ \\ 18\text{ = M} \end{gathered}[/tex]Therefore, Rihanna must swim for 18 minutes to burn 205.8 calories.
ANSWER:
205.8 = 10.6M + 15
Rihanna must swim for 18 minutes