Answer:
In linear expresiion 3 is the coefficient
X will be the variable and -15 will be the constant term.
Answer: 
Step-by-step explanation:
For this exercise you need to remember:
1) The mulitplication of signs:

2) By definition, like terms contain the same variables with the same exponent.
Then knowing this, and given the equations:
and 
You must subtract the like terms, which means that you must subtract the numerical coefficients of each term.
Then, you get the result is:

A) Grace is 20
B) Grace is p+5
C) Nicole is q-5
As both are moving in the same direction ,both<span> will travel the </span>same distance<span> till catch up time --</span><span>d</span>
<em>Your answer would be 5, just the number in general.</em>
<em>>[I'ma be honest here and say I had a fraction earlier :P</em>