A rock falls from a bridge into the water below. The equation H=−16t^2+225 gives the height (measured in feet) of the rock above the water after t seconds. Use this information to complete the table below, and then use the table to answer the questions that follow.

Elapsed Time (seconds) 0 1.5 2.5 2.75 3.5 3.75
Height (feet)

1. How high was the bridge?
feet

2. How long does it take for the rock to hit the water?
seconds

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

(x, y)→(x − 8, y − 7)

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enjoy!

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imma say 16%. sorry if its wrong. i'm doing the same stuff right now

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