Answer:
constant: <em>4</em>
coefficent: <em>7, 18 (However, -1 can also be counted as a coefficient, it is just invisible!)</em>
Step-by-step explanation:
coefficient: a numerical or constant quantity placed before and multiplying the variable in an algebraic expression
therefore, 7 and 18 are coefficients. HOWEVER, -1 can also be a coefficient to -z.
constant: a quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions.
therefore, 4 is a constant.
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