This is algebra 1 (solve a system of equation using any method: word problems)

Hence, it will take 9 seconds for kirk to run 63+9=72 yards and catch upto Max.

Step-by-step explanation:

Let 'y' represents the time Max and Kirk took to meet.

Let the distance between the destination where they will meet from the place where Max is be: x yards

So the distance of destination from initial position of kirk is x+9 yards ( As Max is given a head start of 9 yards)

And

Hence,

         By the similar definition of speed we have:

Hence (1) and (2) are the required system of equation.

So on solving the system of equations by elimination method we have:

y=9 and x=63.

Hence, it will take 9 seconds for kirk to run 63+9=72 yards and catch upto Max.

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

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you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)