optics help

[jribbe1]

i need some help with this problem anyone want to give it a shot? thanks

A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 10.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by
(a) the 35.0-mm lens and
m
(b) the 150.0-mm lens?
m

[Doc Al]

Why don't you give it a shot? You'll need the lens equation:
\frac{1}{f} = \frac{1}{o} + \frac{1}{i}

And you'll also need the magnification:
M = -\frac{i}{o}

To understand what these mean, and how to use the sign conventions, read your text!