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After finding 2 roots of an equation, I was asked to type a function to show the "number of real roots". What would that function be?

Solved by S. H. in 25 mins

Hi,
I am having trouble finding the average of a sum.

Solved by I. H. in 19 mins

Up until recently, I've been able to use a period when using the Sum Function as in the days of Lotus. Now it won't accept the period and gives me a #Field! error. I went to Options-Advanced to ensure Lotus compatibility was checked....still nothing.....using a colon requires a Shift+Colon vs just a period....thoughts?
=sum(A1.A2) vs. =sum(A1:A2)

Solved by K. W. in 18 mins

23. Calculate the internal rate of return in C26 using the IRR function, using profit for the entire time period (including startup and project end).

Solved by A. H. in 20 mins

Finding the percentage problem. I need the formulae for finding the percentage of students in the subjects

Solved by D. H. in 21 mins