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2 years ago

Multiply 3x8y9.2x5y8

Mathematics

1 answer:

ololo11 [35]2 years ago

8 0

Answer:

$6x^{13}y^{17}$

Step-by-step explanation:

We need to multiply

$3x^8y^9.2x^5y^8$

We know the exponent rule of multiplication:

$x^a y^b . x^cy^d = x^{a+c}y^{b+d}$

If the bases are same the powers are added.

So,

$=3*2 *x^8*x^5*y^9*y^8\\=^{8+5}y^{9+8}\\=6x^{13}y^{17}$

So, the answer is:

$6x^{13}y^{17}$

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Follow the directions to solve the system of equations by elimination. 8x + 7y=39 4x – 14y = -68

harina [27]

Step-by-step explanation:

Hey there!

Here;

The equations are;

$8x + 7y = 39.......(i)$

$4x - 14y = - 68..........(ii)$

Multiplying equation (i) by 2.

16x + 14y = 78

4x - 14y = -68

20x = 10

$x = \frac{10}{20}$

x = 1/2.

Putting value of 'x' in equation (i).

$8 \times \frac{1}{2} + 7y = 39$

$4 + 7y = 39$

$7y = 3 9 - 4$

$y = \frac{35}{7}$

Therefore the value of y is 5.

Check:

Put value of x and y in equation (i).

8x + 7y = 39

$8 \times \frac{1}{2} + 7 \times 5 = 39$

$4 + 35 = 39$

$39 = 39$

(True).

Therefore, the solution is ; (1/2,5).

Hope it helps...

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disa [49]

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3 years ago

Which expression is equivalent to the following complex fraction?

Alex17521 [72]

Answer:

$\frac{x - 1}{2x}$

Step-by-step explanation:

This is a correct answer.

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2 years ago

Last week, Mr. Thomas rode his bike 49 miles. This week, Mr. Thomas rode his bike 14 miles less than he did last week. Part A. M

soldi70 [24.7K]

Part A
49-14 = 35
35/7 = 5 

Part B
5 miles each day

Part C
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3 years ago

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strojnjashka [21]

$\cosh x=\dfrac{e^x+e^{-x}}2$

So

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