The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.
Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3
The answer is 3 seconds.
20%, I believe. The piece of wood lost 2 ounces of moisture after drying, and 2/10 = 20/100
Answer: 78 pounds
Explanation: if 1 kilogram is 2.2 pounds, just multiply the weight in kg by 2.2:
35.4 x 2.2 = 77.88
Round to nearest whole: 78.
So the dog is 78 pounds
The square root of 36/100 is c. -6/10 and 6/10
You can get this by using a calculator.
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0.00000004 to the power of 4
Your answer would be <u>0</u>
