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Mathematics 7 Online
OpenStudy (anonymous):

How to add

OpenStudy (anonymous):

I need to add this problem

OpenStudy (noorik.):

ok, what problem?

OpenStudy (anonymous):

and this The perimeter of a paved area being built at a playground is going to be 46 meters. If the length and width are each a whole number of meters, what should the length and width of the area be to cover the greatest possible area? Draw a picture and make an organized list to solve.

OpenStudy (noorik.):

\[\frac{ 51 }{ 4 } + \frac{ 32 }{ 4 }\]

OpenStudy (anonymous):

NOPE

OpenStudy (anonymous):

It's 5 and 1/4 and 3 and 2/4

OpenStudy (noorik.):

ok got it

OpenStudy (anonymous):

Do i keep that d. the same or change it??

OpenStudy (mathmale):

@California_Babe : Please post only one question at a time. 5 1/4 and 3 2/4 are "mixed numbers;" they are part integer and part fraction. There are at least two ways to do this: 1) Add the integer parts separately; add the fractional parts separately; add the two results together. 2) Convert both 5 1/4 and 3 2/4 to improper fractions: 21/4 and 14/4; add these, and then express the result as another mixed number. Your choice! Please show your work.

OpenStudy (mathmale):

You have the same denominator in both fractions, so by all means keep it.

OpenStudy (anonymous):

7 3/4????

OpenStudy (noorik.):

good work mathmale for the other problem you must make a function of the area A = x * y f(x) = A , x= length, y=width then you have to find the relation, you can set it from the perimeter 46 = (x+y) * 2 23 = x + y x = 23-y substitute in the function A = (23-y) * y A = 23y - y^2 then find the derivative \[A \prime =23 - 2y\] \[A \prime =0\] 0 = 23 - 2y 2y = 23 y = (23)/2 then x = 23 - (23)/2 = (23)/2

OpenStudy (anonymous):

THX!!

OpenStudy (noorik.):

u r welcome

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