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goldfiish [28.3K]
3 years ago
9

1In the example problem, 2.4 X 10^6 was rewritten as 24 X 10^5. Explain why those expressions are equivalent.

Mathematics
2 answers:
Vsevolod [243]3 years ago
7 0

Answer:

2.4\times 10^6=24\times 10^5

Reason :

When in a decimal number the decimal shifted right the exponent of 10 is decreased by the number of shifting while if it is shifted left the exponent of 10 is increased by the number of shifting,

Why ?

2.4\times 10^6 =\frac{24}{10}\times 10^6=24\times 10^{-1}\times 10^6=24\times 10^{-1+6}=24\times 10^5

( By using a^m = \frac{1}{a^{-m}} and a^m.a^n=a^{m+n} )

USPshnik [31]3 years ago
3 0

Answer:

See explanation

Step-by-step explanation:

Note that

10^6=1,000,000\\ \\10^5=100,000

Then

2.4\times 10^6=2.4\times 1,000,000=2,400,000\\ \\24\times 10^5=24\times 100,000=2,400,000

As you can see, the results are the same, so

2.4\times 10^6=24\times 10^5

This means that two given expressions are equivalent.

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A farmer with 950 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to o
Gelneren [198K]

Answer:

22,562.5 ft²

Step-by-step explanation:

The largest possible area will be obtained when half the fencing is used for the long side of the 4 pens, so the dimension in that direction is (950 ft)/(2·2) = 237.5 ft.

The other half of the fencing will be used for the 2 ends and 3 partitions, each of which will be (950 ft)/(2·5) = 95 ft.

Then the overall area of the 4 pens is ...

... (237.5 ft)(95 ft) = 22,562.5 ft²

_____

<em>General Solution</em>

Suppose L is the length of fence available, and x is the length of the long side of the enclosed area. For n pens, the enclosed area will be ...

... A = x(L-2x)/(n+1)

For constant values of A, L, n, this describes a downward-opening parabola with zeros at x=0 and x=L/2. The vertex of the parabola (point of maximum area) will be halfway between these zeros, at x = (0 + L/2)/2 = L/4. That is, half the available fence is used in each of the orthogonal directions.

Note that adding partitions in the other direction replaces the 2 in the equation with (m+1), where m is the number of pens between the sides of length x. That is, if there are 4 pens in one direction by 3 pens in the other direction, the area will be

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6 0
3 years ago
Determine if (-1,9) and (-2,6) are solutions to the system of equations: x + y = 8 x2 + y = 10 A) Both are solutions B) Neither
Dahasolnce [82]

Answer:

D) Only (-1,9) is a solution.

Step-by-step explanation:

x+y =8

x^2 + y = 10

Lets check the first point (-1,9)

Put in x =-1 y =9

x+y =8

-1+9 = 8

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This works

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This works

Lets check the second point (-2,6)

Put in x =-2 y =6

x+y =8

-2+6 = 8

4=8

This  does not work

We can stop now.  (-2,6) cannot be a solution

7 0
3 years ago
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