1. Give the nuclide symbol for calcium ion based on the following data:
Number of protons = 20
Number of neutrons = 20
Number of electrons = 18

-1   1/6.   you dont subtract the denominators

step-by-step explanation:

i those same problems in math and dont know how to do them

the given 6 = w/p is equivalent to 6p = w, where w is the total area of the walls and p is the area covered by a single can of paint.

knowing that 6 cans of paint will be needed, 6p = w becomes 6(6) = w = 36.   this tells us that the total area to be painted is 36 square units.