A combination of two lens having power +4.25 and -2.25 is used an object is placed 10cm away calculate image distance and nature

(b)!Let the object distance be x. The image distance must be x + 5 as the image distance must be larger due to nature of the concave mirror.!! The magnification is negative since a concave mirror produces inverted images

Explanation:

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..