The sum of twice a number n and 8 at most 25

2n + 8 ≤ 25     |subtract 8 from both sides

2n ≤ 17     |divide both sides by 2

n ≤ 8.5

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

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choice b

step-by-step explanation:

f(x) = 88x^2 -264x + 300

the line of symmetry of a parabola is defined by

h = -b/2a

where ax^2 +bx+c=0

so

h = - -264/ (2*88)

h = 3/2

so x = 1.5