In the following, write an expression in terms of the given variables that represents the indicated quantity:
a. The cost of having a plumber spend h hr at your house if the plumber charges $30 for coming to the house and $x per hour for labor
b. The amount of money in cents in a jar containing some nickels and d dimes and some quarters if there are 4 times as many nickels as dimes and twice as many quarters as nickels
c. The sum of three consecutive integers if the greatest integer is x
d. The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria triples every 30 sec. (Hint: The answer should contain q as well as n.)
e. The temperature t hr ago if the present temperature is 40°F and each hour it drops by 3°F
f. Pawel's total earnings after 3 yr if the first year his salary was s dollars, the second year it was $5000 higher, and the third year it was twice as much as the first year
g. The sum of three consecutive even whole numbers if the greatest is x
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