25 = 1/3n - 10
algebraic expression

-25=1/3n - 10

move -10 to the other side

sign changes from -10 to +10

-25+10=1/3n-10+10

-25+10=1/3n

-15=1/3n

multiply both sides by 3/1 to get n by itself

(-15)(3/1)=1/3n(3/1)

cross out 3 and 3 and 1 and 1, divide by 3 and 1

then becomes 1*1*1*1*n=n

(-15)(3/1)==45/1=-45

n=-45

(-1,-0.5)

step-by-step explanation:

hello, there is a new name in town and that's the human spider!

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

merry christmas!

~

your friendly neighborhood human spider! .