Well I was pretty good in my algebra and biology classes a while ago. Whatcha got, sweetie?

I need to calculate the size of a specimen irl based on its length in millimeters in the given diagram

Oh that's just conversions isn't it? I'm sure we can work it out :-)

Well the formula given was [(length of critter in diagram)x(real field of view diameter)]/(field of view diameter in diagram)

Alrighty, let's fill in the numbers then. How long is the diagram critter?

6.36 mm

And what field of view is it being seen under, myrtle?

Low power objective lens. Its got a diameter of 2mm I think

Okay, what's the real field of view diameter? Is that the diameter of the microscope lense?

Yeah. Wait I got confused just a moment

Oh?

So the real field of view is 2mm but in the diagram it's 32 mm

So that's (6.36*2)/32

Or ~0.398

Okay...I think I can do the rest from there. Thank you granny!

Glad I could help, dearie :-)