X=−6.58578643, −9.41421356 what is the rounded decimal of these two?

Depends on which place you're rounding to:

Step-by-step explanation:

Rounded to the tenths place (one number after the decimal point):

x = -6.6, -9.4

Rounded to the hundredths place (two numbers after the decimal place):

x = -6.59, -9.41

Rounded to the thousandths place (three numbers after the decimal place):

x = -6.586, -9.414

I don't think you'd need to round to the ten-thousandths place. If you do lemme know and I'll edit my answer. But you should know if the next digit is 5 or greater like in 15 you'd round up. If it's less than 5, you round down.

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

a

step-by-step explanation:

the answer is a