12. Write a function rule in slope-intercept form for the statement: the output is one less than half of the opposite of the input.

y = (1/2)*x - 1

Step-by-step explanation:

a linear relationship is something like:

y = a*x  + b, lets find the values of a and b.

We have that the output (y) must be 1 less than half of the imput (x), then our relation is:

y = (1/2)*x - 1

step-by-step explanation:

a

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)