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Answers by Maurizio T.

f(x)=-x^3-3x^2 (answer)

What have you done so far?  Just asking tutors to do your homework is not exactly the way this is supposed to work. The domain is impossible to miss, the range may require a little more thinking, but if you show where you got stuck, we could try helping.  

Word problem (answer)

You have been asking several questions over a short period of time. Are you trying to get tutors to do your homework? We can do it, but how do you learn?   In any case, if you walk 2 miles a day, how many miles do you walk in 10 days?  10x2=20, right? So, what is so difficult...

Statistics (answer)

Your first task is to recognize what probability distribution (either discrete or continuous) is the right one for your particular case.   Here the "experiment" looks at a certain time interval (Saturday  morning, 10am -11am) and we are told that ON AVERAGE every such...

Let y = x1/3. Then, I assume you can see that you can write the expression you were given as   y2 - 7y + 12 = 0  (*)   This is a trinomial that you should easily be successful in factoring . If you don't, then there is no point in writing down the full solution...

STAT qustion (answer)

Well, you are provided with the probability of a strike in the specific region for a specific type of fish, i.e. p = 0.48. Then, you are told that there is a total of 22 strikes. This info alone should alert you to what is the relevant distribution you need to use. (22 trials, probability...

Well, it is a somewhat bizarre way to assign a stat problem. I will not solve it for you for in that case you get nothing out of it.  But, if you are testing:   H0: p ≤ 0.5  vs. H1: p > 0. 5   Then you reject H0 if a certain statistic is greater than...

statistics help (answer)

You are provided with the right hint. Let X = number of fatal crashes.  You can derive the probability associated with X by using the Number of days Total number of days = 144+172+128+37+7+1 = 489 (check the calculations!)   Prob. [X=0] = 144/489 = 0...

Let A = "exam covers chapter 1"      B = "exam covers chapter 2"   You know that P(A) = 0.45; P(B) = 0.63, and P(A or B) = 0.76.   You are asked P(A and B) and there is a formula for it,right? Recall that P(A or B) = P(A) +...

How about starting from the properties of logs:   a*ln(b) = ln(ab) ln(a)-ln(b) = ln(a/b)   Also, recall that ln(x) is defined only if x > 0.    So ln(x^2+1) - 3ln(x)  = ln(x^2+1) - ln(x^3) = ln(x^2+1/x^3) = ln(2)  ...

log1/4[(1/4)-2x] = log1/4(64)  -2x = log1/4 64 -2x = log10(64)/log10(1/4) = loge(64)/loge(1/4) = -3 Thus x = 3/2 = 1.5   In fact we can check that (1/4)-2(3/2) = (1/4)-3 = 43 = 64   Remember that to find logaB for any base a, we can always use the logs...

log(log x)=4 (answer)

Well... 10,000 cannot be right. In fact,   log(log(10,000) = log(4) .   Think of it like this:   10log(log(x)) = 104   which is the same as:   log(x) = 104   And therefore x = 10^104 which is a huge number:  1010...