Which portion of the expression is the coefficient?

5y6

a) 5
b) y
c) 6
d) 5y6

Reflect the point (7,0) across the y-axis

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places