Conditional formatting allows spreadsheet users to a> turn cell protection functions on and off. b> calculate the average number of people at sporting events. c> highlight test scores of below 90% in a grade book. d> add additional formatting options to a menu.

C

Explanation:

Conditional formatting is used to apply specific formatting to the data. It allows you to highlight cells with specific data. Also, it allows you to differentiate your data. like in the option C, you can highlight test scores above 90% using conditional formatting.  

start by isolating the variable on one side by adding 43w^2 to both sides.   the equation will read:

25w^2+5=0

*subtract 5 from both sides*

25w^2=-5

*divide both sides by 25*

w^2=-1/5

*take the square root of both sides*

w=√(-1/5)

the square root of -1 is i.   the square root of 5 remains √5

the answer is i/√5.

hope this

answer; closing the loop;