A farsighted person has a near point of 55 cm rather than the normal 25 cm . Part A What strength lens, in diopters, should be prescribed to correct this vision problem

We have do = 25cm and di = -55cm

So 1/f = 1/do + 1/di = 1/25 + 1/(-55) = 2.214x10^-2

So f = 1/2.214x10^-2 = 45.2cm

So power = 1/0.452m = +2.21 Diopters (converging lens)

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answer: d.) the total number of protons and neutrons is 15

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12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !