If an image of an object 3.0 cm in height is formed along the principal axis 10.0 cm from a concave mirror with the focal length 8.0 cm. What is the object's distance from the mirror?

What is the image’s height?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

I’m stuck on this equation, anyone got the answer?