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lana66690 [7]
3 years ago
7

6/a - 4/b = 1 and 9/a - 8/b = 1​

Mathematics
1 answer:
Alja [10]3 years ago
5 0

Answer:

a = 3 ; b = 4

Step-by-step explanation:

Eqn.1 = \frac{6}{a}  -  \frac{4}{b}  = 1

Eqn.2 = \frac{9}{a}  -  \frac{8}{b}  = 1

Both the eqns have RHS (Right Hand Side) equal. So,

\frac{6}{a}  -  \frac{4}{b}  =  \frac{9}{a}  -  \frac{8}{b}

=  >  \frac{6b - 4a}{ab}  =  \frac{9b - 8a}{ab}

Cancelling ab from both the denominators of both the sides,

=  > 6b - 4a = 9b - 8a

=  > 8a - 4a = 9b - 6b

=  > 4a = 3b

=  > a =  \frac{3b}{4}

Putting the value of a in Eqn.1,

\frac{6}{ \frac{3b}{4} }  -  \frac{4}{b}  = 1

=  >  \frac{24}{3b}  -  \frac{4}{b}  = 1

=  >  \frac{8}{b} -  \frac{4}{b}   = 1

=  >  \frac{8 - 4}{b}  = 1

=  > b = 4

Putting the value of b in the value of a

a =  \frac{3 \times 4}{4}  = 3

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Step-by-step explanation:

Part A:

So the height is going to be x when you fold the sides up. So that's one part of the volume but for the width it was going to be 4 but since two corners were cut out with the length x the new width is going to be (4-2x). The same thing applies for the length which should be 8 inches but since two corners were removed with the length x it's now (8-2x)

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Part B:

The volume can be graphed although there must be a domain restriction since the height, width, or length cannot be negative. So let's look at each part of the equation

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for the (8-2x) the x must be less than 4 or else the length is negative

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Step-by-step explanation:

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3 years ago
A King in ancient times agreed to reward the inventor of chess with one grain of wheat on the first of the 64 squares of a chess
maxonik [38]

Answer:

Total weight of the wheat placed on 45th square will be = 1.26\times 10^{6}tons

Step-by-step explanation:

King rewarded the inventor of chess by giving grain of wheat on every square of the chess board. He places one  grain of wheat on first square, 2 on second, 4 on 3rd, 8 on 4th and so on.

In fact he places grains of wheat in a progression S = 1, 2, 4, 8, 16.........n terms where value of n is 64.

We can rewrite the progression as S = 2°, 2, 2², 2³,.........n terms (n = 64)

In a geometric progression we know the nth term = a(r^{n-1})

where a = first term of the series, r = common ratio, n = number of terms

Now we have to calculate the weight of all wheat placed on 45th square.

So we will put the values in the given formula 45th term =

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3 years ago
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Rus_ich [418]

Answer:

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Step-by-step explanation:

Calculation of the discriminant of the polynomial : x⋅2−4⋅x+5

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2. Δ=(−2)2−4⋅(0)⋅(5)=4=4

3. The discriminant of the polynomial x⋅2−4⋅x+5 is equal to 4

5 0
3 years ago
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