Kayla began a science project with 18 grams of an unknown solid . During the experiment the change in mass of the solid -7 grams . What was the mass number f the solid at the end of the experiment

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answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb

answer: 24

step-by-step explanation:

7x2=14

5x2=10

10+14=24