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sweet [91]
3 years ago
8

How can you express 499 to find the product 499×5 using mental math explain

Mathematics
2 answers:
Marysya12 [62]3 years ago
6 0

Answer:

So the answer would be 2495.

Step-by-step explanation:

We can write 499 as  500 - 1

Because we can easily multiply 500 to 5 compare to 499 to 5.

So product of 499 × 5 = (500 - 1) × 5

                                  = 500 × 5 - ( 1 × 5 = 5 )

                                  = 2500 - 5 = 2495

So the answer would be 2495.

Hoochie [10]3 years ago
3 0
499 = 500 - 1
(500-1)(5) = 2500 -5 = 2495

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Find the product of z1 and z2, where z1 = 2(cos 80° + i sin 80°) and z2 = 9(cos 110° + i sin 110°)
nekit [7.7K]
ANSWER

z_1 z_2=18( \cos( 190 \degree  )  + i \sin( 190 \degree) )


EXPLANATION

The given complex numbers are;

z_1 = 2( \cos(80 \degree)  + i \sin(80 \degree) )

and


z_2= 9( \cos(110 \degree)  + i \sin(110 \degree) )


Recall the binominal identity for complex numbers in polar form.



z_1 z_2=r_1 r_2( \cos( \theta_1 +\theta_2)  + i \sin(\theta_1 +\theta_2) )



We apply this property to obtain,


z_1 z_2=2 \times 9( \cos( 80 \degree +  110 \degree  )  + i \sin(80 \degree +  110 \degree) )



z_1 z_2=18( \cos( 190 \degree  )  + i \sin( 190 \degree) )

4 0
4 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
Solve.<br> 4 Is 24 equal to 2.4? Explain.
Mrac [35]

\huge\text{Answer:}

No, 24 is not equal to 2.4 \huge\checkmark

\huge\text{Step By Step explanation:}

Hi there, hope you are having a nice day! :)

No, 24 isn't equal to 2.4.

24 =twenty=four

2.4=two point four

Remember, the decimal point (.) means a lot.

If we move it 1 unit to the right, we multiply by 10:

2.4 *10=24

If we move it 1 unit to the left, we divide by 10:

24÷10=2.4

Hope you find it helpful.

Feel free to ask if you have any doubts.

\bf{-MistySparkles^**^*

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Step-by-step explanation:

As Given In Question

We Have A Triangle With Side PQ=8cm

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PQ' = 3/4 * 8

PQ' = 6 cm

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so the line segment PQ is divided into PQ' : Q'Q = 3 : 1

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