Chapter 8.2B, Problem 4A

In the following descriptions, write an expression in terms of the given variables that represent the indicated quantity:

a. The cost of having a plumber spend $h$ hours at your house if the plumber charges $\$30$ for coming to house and $\$x$ per hour for labor.

b. The amount of money in cents in a jar containing some nickels, $d$ dimes and some quarters if there are $4$ times as many nickels as dimes and $3$ times 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 $20\sec$. (The answer should contain q as well as n.)

e. The temperature $t\text{hr}$ ago if the present temperature is $40°\text{F}$ and each hour it has dropped by $3°\text{F}$.

f. Pawel’s total earnings after $3\text{yr}$ 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 $x$.