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2 years ago

If I add 9 to my number,I get 6.what is my number?

Mathematics

2 answers:

aleksley [76]2 years ago

7 0

You can set up the equation x+9=6. So the number will be -3

vovangra [49]2 years ago

7 0

-3, which the equation would be -3 + 9, which you would really subtract, so 9 - 3.

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Let $b_1,b_2,\ldots,b_{20}$ be the 20 marks of the boys, and $g_1,g_2,\ldots,g_{10}$ be the 10 marks of the girls.

We know that the global mean was 70, meaning that

$\dfrac{b_1+b_2+\ldots+b_{20}+g_1+g_2+\ldots+g_{10}}{30}=70$

Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is

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By the same logic, we work with the marks of the boys alone: we know the average:

$\dfrac{b_1+b_2+\ldots+b_{20}}{20}=62$

And we deduce the sum of the marks for the boys:

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Which implies that the sum of the marks of the girls is $2100-1240=860$

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2 years ago

The figure shows the front side of a purse in the shape of a trapezoid.

attashe74 [19]

For this case, what you must do is take out the area of two triangles and add it to the area of a rectangle to find the total area.
We have then:
Triangle area:
A = (1/2) * ((13-9) / (2)) * (10) = 10 in ^ 2
Rectangle area:
A = (9) * (10) = 90 in ^ 2
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Salsk061 [2.6K]

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