156 km = _____ miles. Expressed in scientific notation, this is: _____ miles. 25

Question

156 km = _____ miles. Expressed in scientific notation, this is: _____ miles. 25 barrels of oil = liters of oil. Expressed in scientific notation, this is _____ liters. A rectangle is 2 inches by 4.1 meters in size. What is the area of the rectangle in square millimeters? Answer, in scientific notation: _____. A 0.1-liter container holds _____ gal, expressed in scientific notation. 125 acres = _____ km^2, expressed in scientific notation. 215.3 yards = _____ mm, expressed in scientific notation. A snail moves 1.2 meters per day. How many centimeters per second does the snail move (expressed in scientific notation)? How many milligrams of a pesticide are in 156 ml of a 28.2 microgram/ml water sample?

Explanation / Answer

10. We know that 1 km=0.621371 miles
so, 156 km= 96.9339 miles
In scientific notation the cofficient should be greater than or equal to 1 and less than 10

So, in scientific notation 96.9339 miles is 9.69339 × 101

11. 1barrel=158.98722 litres
   25 barrela=3974.6808 litres
In scientific notation it will be 3.97468 × 103

12. given length of rectangle= 2inches
length=50.8 mm

breadth= 4.1metres
breadth= 4100 mm

Area of rectangle=l*b
area=4100*50.8= 208,280 mm2

Scientific notation of 208280 is 2.0828 × 105

13. 1 litre= 0.264172 gal
   0.1 litre= 0.0264172 gal

Scientific notation of 0.0264172 is 2.64172 × 10-2

14. 1 acre= 4046.86 square metres
   125 acres= 505857 square metres

In scientific notation it will be 5.05857 × 105

15. 1 yard= 914.4 mm
   215.3 yards= 196870.32 mm

In scientific notation it will be 1.9687 × 105

16. 1 meter/day =0.00115741 cm /sec
   1 day= 86400 seconds and 1 meter =100 cm
So, 1 meter /day = 0.00138889 cm /sec

In scientific notation 1.38889 × 10-3 cm /sec

17. 1 ml of water has 28.2 micrograms of pesticide
   156 ml of water has 4399.2 micrograms of pesticide

1 microgram= 0.001 milligram
4399.2 micrograms= 4.3992 milligrams

The scientific notation is 4.3992 × 100 milligrams

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