15. what are the coefficients of the expression 7xy - 4xy? + 8?
a. 3.2
b. 7. -4
c. 7xy - axx²
d. 7xy - 4xy2, 8

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}