(15 pts) what is 538.78314 rounded to the nearest tenth?me asap! you

How to get this

The first step is to locate the tenths decimal place, which just to the right of the decimal point. So the "7" is in the tenths place.

Look one spot further to the right. We see the value 8 here. Since 8 is larger than 5, it tells us to bump the prior "7" up by 1 and

This means 538.78 turns into 538.8

You can think of it as saying "78 is closer to 80, rather than 70" which is why we round the "0.78" portion up to "0.80"

note: 538.8 is the same as 538.80; the zero at the end has no effect on changing the value.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

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