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In the following, write an expression in terms of the given variables that represents the indicated quantity. Complete parts a through g. C=) 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. The expression for the cost of the plumber coming to the house is 30 +xh dollars. (Simplify your answer.) b. The amount of money in cents in a jar containing some nickels and d dimes and some quarters if there are 8 times as many nickels as dimes and twice as many quarters as nickels. The expression for the amount of money in the jar is | cents. (Simplify your answer.)