Least to greatest..pls

The list that shows the numbers ordered from least to greatest is:

Step-by-step explanation:

To identify what is the least number or the greatest number in the list, first, we're gonna show all the numbers in their decimal form:

Now, we must to identify the least number in the list, as you can see, it's 0.7071067812, more or less 0.71, by this reason must be the first number, the next number is 0.7853981634, more or less 0.79, so must be the second number, the third number can't be because 0.833333333 is greatest than 0.8, so the third number is 0.8 and the last number is in the ordered list from least to greatest, and the option give us that order is the A option.

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