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3 years ago

What is 78.74 rounded to the nearest tenth?

Mathematics

2 answers:

tia_tia [17]3 years ago

6 0

Answer:

It is 80

Step-by-step explanation:

because when it is ten you take the number right next to it and if it is above 5 then you round it up

hope it helps, murdle

sveticcg [70]3 years ago

4 0

Answer:

The answer is 80

Step-by-step explanation:

78.74 is closer to 80 than it is to 70.

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yKpoI14uk [10]

Answer:

(the relation you wrote is not correct, there may be something missing, so I will simplify the initial expression)

Here we have the equation:

$sin^4(x) + cos^4(x)$

We can rewrite this as:

$(sin^2(x))^2 + (cos^2(x))^2$

Now we can add and subtract cos^2(x)*sin^2(x) to get:

$(sin^2(x))^2 + (cos^2(x))^2 + 2*cos^2(x)*sin^2(x) - 2*cos^2(x)*sin^2(x)$

We can complete squares to get:

$(cos^2(x) + sin^2(x))^2 - 2*cos(x)^2*sin(x)^2$

and we know that:

cos^2(x) + sin^2(x) = 1

then:

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This is the closest expression to what you wrote.

We also know that:

sin(x)*cos(x) = (1/2)*sin(2*x)

If we replace that, we get:

$1 - \frac{sin^2(2*x)}{2}$

Then the simplification is:

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3 years ago