Question

Karin observed that the water level in the part of the river she observed fell 1.68 millimeters per year for 1.5 years. Use the distributive property to calculate the exact variation in water level for the time period.
_____ millimeters

Answer 1

Answer:

The exact variation in water level for the time period is -2.52 millimeters.

Step-by-step explanation:

It is given that the water level in the part of the river fell 1.68 millimeters per year.

The exact variation in water level for one year time period is -1.68.

$1\text{ year} =-1.68\text{ millimeters}$

$1.5\text{ year} =-1.68\times 1.5\text{ millimeters}$

$1.5\text{ year} =-1.68\times (1+0.5)\text{ millimeters}$

$1.5\text{ year} =-1.68-0.84\text{ millimeters}$

$1.5\text{ year} =-2.52\text{ millimeters}$

Therefore the exact variation in water level for the time period is -2.52 millimeters.

Answer 2

-2.52 is the right answer