What does it mean when there is no coefficient of the variable?

a.) there is an error in the equation
b.) the coefficient is zero
c.) the implied coefficient is 1
d.) the coefficient is negative

The answer is C - The implied coefficient is 1. 

The coefficient of a term is the number that comes before the variable. in this case, when there is no coefficient, it is understood that that the coefficient of the variable is equal to 1. Examples are x, y , z, a, etc. Hence the answer to this problem is C.

The full question isn’t shown. part of it is cut off

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.