Answer:
5.12 seconds to the nearest hundredth.
Step-by-step explanation:
When the ball hits the ground h = 0 so
-16t^2 + 81t + 5 = 0
t = [ -81 +/- sqrt ((81^2 - 4 * -16 * 5)]/ (2*-16)
= (-81 +/- sqrt 6881) / -32
= 5.12 , -0.6
So the answer is 5.123 seconds.
Answer:
factors are basically numbers that can multiply by another number to get a certain number
Step-by-step explanation:
for example, the factors of 12: 1,2,3,4,6,12
you should count from the lowest to highest number to make it easier for u.
look at 1 and 12 in the sequence. 1 x 12 = 12
now look at 2 and 6. 2 x 6 = 12
now look at 3 and 4. 3 x 4 = 12
see what i mean?
an example of a non-factor would be 5. 5 can't multiply by anything to get 12. You need to find numbers between 1 and the certain number (12 in this example) and you need to find numbers that can multiply by another number to get that certain number but u can't go beyond the certain number. 7 can't multiply by anything to get 12. if u still don't understand, here is an easier way to help u.
the best thing to do is write the numbers from 1 - 12. 1 2 3 4 5 6 7 8 9 10 11 12
once u do that, you need to ask yourself: which numbers can multiply to get 12? 1 can multiply by a number to get 12. 2 can. 3 can. 4 can. <em>5 can't. </em>once you find a number that you can't multiply by, that is <em>not </em>a factor of the certain number you're looking for.
Hope this helps you :D
Answer:
10.2
Step-by-step explanation:
remove .13 from there
Answer:
Minimum percentage = 88.89%
Step-by-step explanation:
We are given the following in the question:
Mean, μ = 95 dB
Standard Deviation, σ = 8 dB
Chebyshev's rule:
- According to this rule atleast
percent of data lies within k standard deviation of mean.
We have to find the minimum percent of data lying within 3 standard deviations of the mean.
Putting values, we get,
Thus, minimum 88.895 of data lies within 3 standard deviations of the mean.
T = 0 ?
Hope this helps, sorry if it's wrong :)
