Pls help me i know the answer but i have no idea how it comes.

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Aphysical change is a change in the size, shape,, or stafe of matter true or false

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present