Question

A leak in a water tank causes the water level to decrease by 3.6×10−2 millimeters each second. About how many millimeters does the water level in the tank decrease in 5 hours, or 1.8×104 seconds? Drag and drop the values to the boxes to express the answer in scientific notation.

2
5
5.4
6.5
10^-8
10^-2
10^2
10^6

Answer 1

For this case, the first thing you should do is multiply the rate of decrease by time.
We have then:
(3.6 × 10-2) * (1.8 × 104)
= 648 mm
We are going to convert this number into scientific notation:
= 6.48 * 10 ^ 2 mm
Rounding we have:
= 6.5 * 10 ^ 2 mm
Answer:
The water level in the tank decreases in 6.5 * 10 ^ 2 millimeters in 5 hours