Question

Matea recorded that water levels in one part of the river fell 1.05 millimeters per year for 2.48 years. Describe how you could estimate the total variation in water level

Answer 1

The decrease of the decimal rate -1.05 mm/year can be rounded to -1. You don’t need to round 2.48 because you’re multiplying by -1. Since -1.05 is negative and rounded to a greater value, the estimate could be adjusted to a slightly lesser value, maybe -2.5 or -2.6.

Explanation:

If you don't want to use that answer this is what they are looking for

Round -1.05 mm/year to –1.

Estimate the total variation as (-1)(2.48) = -2.48 mm.

Because -1.05 is negative and rounded to a greater value, adjust the estimate to -2.5 or -2.6 millimeters

Answer 2

The decrease of the decimal rate -1.05 mm/year can be rounded to -1. You don’t need to round 2.48 because you’re multiplying by -1. Since -1.05 is negative and rounded to a greater value, the estimate could be adjusted to a slightly lesser value, maybe -2.5 or -2.6.

Explanation: