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

Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.