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V125BC [204]
3 years ago
9

Express this number in scientific notation.

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
5 0
9.647 x 10^7 should be the unrounded answer
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A belt and a wallet cost $42 while 7 belts and 4 wallets cost $213. Calculate the cost of each item.
Fittoniya [83]
Let, the cost of a belt = x
cost of a wallet = y

Then, system of equations would be:
x + y = 42
7x + 4y = 213

Multiply 1st equation by 4, 
4x + 4y = 168
Substitute it from 2nd equation, 
3x = 45
x = 15

Now, substitute it in 1st equation, 
15 + y = 42
y = 42 - 15 = 27

In short, Belt costs $15 and wallet costs $27

Hope this helps!
3 0
3 years ago
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Find two positive real numbers whose product is a maximum. the sum is 80
Eduardwww [97]
Let's say the numbers are "a" and "b"

thus \bf y=ab\qquad 
\begin{cases}
a+b=80\\
b=80-a
\end{cases}\implies y=a(80-a)\implies y=80a-a^2\\\\
-----------------------------\\\\
\cfrac{dy}{da}=80-2a

set the derivative to 0, and check the critical points, there's only one anyway

and do a first-derivative test, to see if it's a maximum
4 0
3 years ago
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How do you compare and order fractions?
AveGali [126]

Answer:

Give each a common denominator

Step-by-step explanation:

So let’s say you have 1/2 and 2/4 how would you know which is bigger well we know both 2 and 4 go into 4 so 1/2 x2 = 2/4 so these 2 are equal

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3 years ago
Hey guys please help me oleaseee
saul85 [17]

Answer:

8'2

Step-by-step explanation:

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3 years ago
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PLEASE HELP WILL REWARD!
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More than $1137.50 but less than $1327.34
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