Question 317402
"A number cubed less the number tripled" 
{{{N^3-3N}}}
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"The smoke stacks of the luxury liner cleared the bridge by 25 ft as it passed beneath it. Express the height of the stacks in terms of the bridge's height." 
{{{S=B+25}}} where {{{S}}} is the stack height and {{{B}}} is the bridge height.
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"As his reputation and referral business grew, Keith began to charge $75 per service call plus an hourly rate of $50 for the repair and maintenance of home computers. Express the cost of a service call in terms of the number of hours spent on the call."
{{{C=75+50*H}}}