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A paper airplane was thrown from the top of a tall building, The height of the paper airplane above the ground can be found using the function y= -1.5x+60, where x is the time in seconds the airplane has been in the air.

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Answer:

How many seconds did it take the paper airplane to reach the ground?

40 Seconds.

Step-by-step explanation:

When the paper airplane touches the ground is equivalent to having a height equal to zero (y=0). So replacing in the equation:

[tex]y= -1.5x+60\\0= -1.5x+60\\1.5x=60\\x=\frac{60}{1.5} \\x=40[/tex]

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