Exercise 17 Page 26

The miles you are from a thunderstorm are calculated by the seconds s that pass between seeing the lightning and hearing the thunder, divided by 5. Let's write this in an equation. miles away=s/5 If a storm is 2 miles away, we can substitute that into the equation above and solve for the number of seconds we would need to count, s.

miles away=s/5

SubstituteValues

Substitute values

2=s/5

MultEqn

LHS * 5=RHS* 5

10=s

RearrangeEqn

Rearrange equation

s=10

If we count 10 seconds between seeing the lightning and hearing the thunder, then, a storm is approximately 2 miles away.