The answer is: 41.256 (You round it to the number that you're required to round it)
225 perch. You set up the equation 4/3=300/x. Then you cross multiply to get 4x=900, then you divide each side by 4 which makes x=225
She will streach her arm in the 2/3 time period becasue you add up all the questins and see the one with the least and that is the answer
Answer:
c.
Step-by-step explanation:
we estimate by rounding the factors to "easy numbers". that means numbers we can easily calculate even in our heads, and we get at just a ballpark number as result for orientation.
59 is much closer to 60 than to 50.
42 is much closer to 40 than to 50.
of course, we round to the closest "round numbers", so that the loss of precision through the rounding is as little as possible, so that the estimation still gives a much value as possible.
and the sum of the differences of the factors should be as close to 0 as possible.
so, 60×40 is the closest and therefore best estimation.
the sum of the factor differences is (+1 - 2) = -1.
compare to the real result :
59×42 = 2,478
answer a and b are by the way not correct :
50×40 = 2000 (and not 2500)
60×50 = 3000 (and not 3500)
FYI - in this case 50×50 = 2500 would be the closest estimation.
and the sum of the factor differences would be (-9 + 8) = -1.
normally, this wide "jumping" (-9 to +8) would make it only second choice.
Just like every other problem, in math or any other subject, you take the
information you have, and the relationships you know between the information
you have and whatever you need to find, and use them together to find what you need. I noticed that you didn't mention what information you have.
In general, the circumference of a circle is (pi) times (the diameter),
or (2 x pi) times (the radius). For 'pi' you can use (22 / 7), or 3.142 ,
whichever is easier for you. Either one will get you close to the real
exact answer.
If you don't know the diameter or the radius of the circle, but you know
something else, like for example the area of the circle, then you've got
a slightly more complicated problem. I can't cover all possible problems
you may run into, because, as I pointed out earlier, you haven't described
what information you already have.