Mathematics: Calcula 40 – {28 – (- 5) + - 9 + (12 – 38 + -25) – (-7)}

Calcula 40 – {28 – (- 5) + - 9 + (12 – 38 + -25)

Ответ:

bvargas786p7aa8y

08.04.2021

Mathematics

Step-by-step explanation:

This is a simple question.

Good luck!

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Ответ:

maddylosin1032

06.09.2021

Mathematics

$a(n)=46-(n-1) \times 4$

Step-by-step explanation:

It's important to know that the graph is showing a linear function, which means its equation cannot be exponential. So, choices A and B are not correct here.

To find the correct equation, we could find the slope first with the following formula and the two given points

$m=\frac{y_{2}-y_{1} }{x_{2} -x_{1} }\\ m=\frac{26-30}{6-5}=4$

Now, we use the point-slope formula to find the equation

$y-y_{1} =m(x-x_{1} )\\y-30=4(x-5)\\y=4x-20+30\\y=4x+10$

Notice that choice C has the same coefficient of 4, which is the slope of the line. Therefore, that's the right answer.

Let's prove it for n=6

$a(n)=46-(n-1) \times 4\\a(6)=46-(6-1) \times 4=46-20=26$

As the table shows.

Therefore, choice C is correct.

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Calcula 40 – {28 – (- 5) + - 9 + (12 – 38 + -25) – (-7)}

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