A meal costs $30 before tax and tip. There is a 7% sales tax. After the tax, a 20% tip is
added.
What is the total after tax and tip?

13.50

Step-by-step explanation:

you multiply 30 with 0.7 to get the tax then divide by 20% of that to get the answer

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

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