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777dan777 [17]
4 years ago
11

How many positive numbers from 1 to 999 have the sum of

Mathematics
1 answer:
Elenna [48]4 years ago
5 0

Answer:

45 positive numbers have the sum of  their digits equal to 8

Step-by-step explanation:

given data

number = 1 to 999

sum n = 8

to find out

positive numbers

solution

we will choose number by this formula

(n+1) (n+2) / 2

here n is 8

so put this value we get number that

positive numbers = (n+1) (n+2) / 2

positive numbers = (8+1) (8+2) / 2

positive numbers = 90 / 2

so 45 positive numbers have the sum of  their digits equal to 8

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X+2y=8<br>2x-y=1<br>mathe question​
Ira Lisetskai [31]

Answer:

x = 2 and y = 3

Step-by-step explanation:

We have

x+2y = 8 -----equation (i)

2x-y = 1 -----equation (ii)

Now,

x+2y = 8

or, x = 8-2y ------equation (iii)

Again,

2x-y = 1

or, 2x = 1+y

or, 2x-1 = y

Putting the value of 'x' from equation (iii)

or, 2(8-2y)-1 = y

or, 16-4y-1 = y

or, 16-1 = y+4y

or, 15 = 5y

or, y = 15/5

or, y = 3

Putting the value of 'y' in equation (iii)

x = 8-2y

or, x = 8-(2×3)

or, x = 8-6

or, x = 2

Therefore, x = 2 and y = 3.

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3 years ago
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Which is greater 3% or 0.3
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They are both equal. 3% converted to a fraction is .3
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Describe an example in which two variables are strongly correlated, but changes in one do not cause changes in the other.
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You can count the spirals because they are coloured.

The left handed spirals are in red and you can count 13.

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