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1 answer:

4 0

Answer is 1/2 ln (x^2+1) + 2 tan ^-1 (x) +c
in order to do this first say (x/x^2+1)+ 2/(x^2+1)
we already know that 1/x^2+1 equal tan^-1 (x)
for the first part you need to say u=x^2+1 and solve it by substitution
I hope this helps..let me know if you need more explanation

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What's 54 divied by blank =6<br><br><br> is it 6,7,8,or 9

andrew11 [14]

54/x = 6...multiply both sides by x
54 = 6x...divide both sides by 6
54/6 = x
9 = x

6 0

3 years ago

A financial talk show host claims to have a 55.3 % success rate in his investment recommendations. You collect some data over th

baherus [9]

Answer:

There is a 25.52% probability of observating 4 our fewer succesful recommendations.

Step-by-step explanation:

For each recommendation, there are only two possible outcomes. Either it was a success, or it was a failure. So we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

In this problem we have that:

$p = 0.553, n = 10$

If the claim is correct and the performance of recommendations is independent, what is the probability that you would have observed 4 or fewer successful:

This is

$P(X \leq 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4)$