Please help meee. ;))) thanks ^_^

1. At a rate of 80km/hr, I can run _________ km in 18 minutes.
2. The area of a circle is 314 sq. cm. How many cm are in its circumference?
3. How many whole numbers between 9 and 100 have an even digit-sum? Note: A digit sum means sum of the digits of a given number.
thansksss pls help mee :33

1

Answers

2015-06-30T16:07:43+08:00
1. formula:
velocity=distance/time
velocity is 80km/hr
time=18mins. or 0.3hr
substitute the given,.
distance=80×0.3=2.4 km....is the answer.

2. area=∏r^2
314=∏r^2
radius=9.9975 or say 10

circumference=2∏r
=2∏(10)
=62.816 cm

3. still unsolved..
but the two problems are correct..
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