Lisa averages 15 mi/h cycling to her school carrying her friend and 20 mi/h on the return trip alone. What is Lisa's average speed for the entire trip rounded to the nearest tenth?

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

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answer: your correct answer is b. d.

step-by-step explanation: