Which of the following represents the difference, D(x) = L(x) - C(x), in their costs?
• D(x) = 175 – 2x
• D(x) = 375 + 8x
• D(x) = 12x – 275
• D(x) = 175 + 2x

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

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

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what is the model?

step-by-step explanation: