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sukhopar [10]
3 years ago
7

This was useless because a selected the exact answers and they where all wrong :(

Mathematics
2 answers:
sergiy2304 [10]3 years ago
5 0

Maybe! I think people are all nice to help. Sometime is wrong but their is nice don't you think?

ivanzaharov [21]3 years ago
3 0

Answer:

srry

Step-by-step explanation:

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El número 18 tiene la siguiente propiedad: al sumar sus dígitos da como resultado1+8=9, y 18 se puede dividir por 9 (el valor de
jeka57 [31]

Step-by-step explanation:

First of all, we can easily find that, for example, 63, has that particular property, therefore Jacinto is wrong.

Now we proceed to show that every (two digit) number is divisible by 3 if and only if it's sum of digits is.

Let n be a natural two digits number, and let a and b be the digits of said number, with

1 \leqslant a \leqslant 9 \\ 0 \leqslant b \leqslant 9

We can write n as

10a + b

Let's call r1 the remainder of 10a/3, with, of course, 0 \leqslant r1 \leqslant 2

(for example, if a=1 then r1=1, because 10=3*3+1)

Now, each power of 10 leaves a remainder of 1 when divided by 3, thus r1 is equal to the remainder of a/3.

As an example, if a=3, then r1=0, because 30=3*10.

And let's call r2 the remainder of b/3.

In order for n to be divisible by 3, r1+r2 must be equal to a multiple of 3 (otherwise the division would leave a remainder).

Now, a can be written as

(a \: multiple \:  of \:  3)+r1

And similarly, b can be written as

(a \:  multiple \:  of  \: 3)+r2

Therefore, a+b is equal to (a multiple of 3)+r1+r2.

But since we already showed that r1+r2 needs to be equal to a multiple of 3, we have that 3 divides n if and only if the sum of its digits is a multiple of 3.

With a similar reasoning we can find that the same holds for 9.

The largest two digits multiple of 9 is 99, but it doesn't work, because 9+9=18, and 99 is odd.

Next up we have 90, which is of course good, since 90/9=10.

It is the largest two digits integer to have this property, since it's easily checked that others do not work

7 0
3 years ago
Brian drove 638 miles in 11 hours.
NemiM [27]

Answer: 638 x= 754*11

638 x= 8294 then divide by both sides by 638

x = 13

she will drive 754 miles in 13 hrs.

Step-by-step explanation:

brainliest me

6 0
3 years ago
Please help me!!!! :)
frutty [35]
DE is the long narrow side, so judging from the picture, we can assume that DE is 6.
3 0
3 years ago
The population of DeSoto rose an
Vanyuwa [196]

Answer:

Please check explanations

Step-by-step explanation:

Here, we want to make an interpretation

From the question, we have that initially when the count was started, there were 5,428 people; this means that the initial value of the data is 5,428

For the rate of change, we have that there is an average increase of 142 people for each of 5 years;

That means per 5 years, there is an increase of 142 people and this is what represents the rate of change

4 0
3 years ago
In each case, use the digits 1 to 9 at most one time each.
krok68 [10]

Answer:

Hello,

x^{11}  = x^{3}  x^{8}  = x^{2}  x^{4}  x^{5}

8 0
3 years ago
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