please help me with both Q1, and calculating theta.

Q1 An object is placed 20.0 cm to the right of a concave mirror with focal length 12.0 cm and 30.0 cm to the left of a converging lens with focal length 10.0 cm, Make a table of three rows, Row-1 , object 20 cm from concave mirror as shown, locate the image created by both the mirror and lens Row-2, object 18 em from concave mirror, locate the image created by both the mirror and lens. Row-3, object 16 em from concave mirror, locate the image created by both the mirror and lens. Plot image distance y-axis versus object distance Find the average slope, rate of change of image distance with respect to the object distance -20.0c-- 30.0 cm A = 120 cm A = 10.0 cm Youtube Phyllca . Optics: Lenpin of 5) Lens Combinations DISKS - OPTY'S RIDERS AND THIN LENSES Secret Scout Fresh GEOMETRY M- Mich Physics - Optic Lenses (5 of 5) Lens Combinations . Converging Lens & Minor E Ating THE BIG PICTURE