hand written solution required

The projection lens in a certain slide projector is a single thin lens. A slide 23.4 mm high is to be projected so that its image fills a screen 1.86 m high. The slide-to-screen distance is 2.98 m. (Enter your answers to at least one decimal place.) (a) Determine the focal length of the projection lens. :mm (b) How far from the slide should the lens of the projector be placed to form the image on the screen? :mm