Question

The water level at Lake Penny changed −1 1/10 in. this year. Next year, it is predicted to change another −1 2/5 in. What is the total change that will likely occur in 2 years?

Answer 1

its 2 1/2

Step-by-step explanation:

Answer 2

Total change that will likely occur in 2 years = -2.5 in.

Step-by-step explanation:

The water level at Lake Penny changed
`-1 (1)/(10)` in first year and
`-1 (2)/(5)` in in the second year. We need to find total change in the two years.

We know that
`a(b)/(c)` can be written as
`(ac+b)/(c)`

So
`-1 (1)/(10)=-((1*10+1))/(10) )=(-11)/(10)`

`-1 (2)/(5)=-((1*5+2)/(5))= (-7)/(5)`

So total change in two years =
`(-11)/(10)+(-7)/(5) =(-11-2*7)/(10) =(-25)/(10) =-2.5inch`

Total change that will likely occur in 2 years = -2.5 in.