1. 7p - 18q + r + 2s - t + 3u + 9
a. The number of terms is 7, they are : 7p - 18q + r + 2s - t + 3u + 9
b. The number of variables is 6, they are: p, q, r, s, t, u
c. The coefficient of p is 7
d. The coefficient of q is (-18)
e. The coefficient of r is 1
f. The coefficient of t is -1
g. The constant is 9
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