I think it's C, because first you multiply all the sides which is 112 then multiply by 3 and the answer it's 336 if I'm correct.
15 is coefficient, a is a variable, 2 and -7 are like terms, 15a is a term and 2 and 7 are constants.
Can be both, because if all three were negative, it would be
negative*negative= positive
positive*negative=negative
example: -1*-1*-1=-1
but if all three were positive, it would obviously be positive, because any number of positives can't make negatives in multiplication.
Theoretically all real numbers ≥0 it just depends on hours driven
I believe the point here is that the function is continuous rather than discrete
E+14 is 100000000000000, so 1.783864 times that is 178386400000000
