11/20/19

#### The half-life of carbon-14 is 5600 years if a piece of charcoal made from the word of a tree shows only 77% of the carbon 14 expected in living matter when did the tree die?

The half-life of carbon-14 is 5600 years if a piece of charcoal made from the word of a tree shows only 77% of the carbon 14 expected in living matter when did the tree die?

10/19/19

#### Show that the integral from 1 to infinity of 1/(1+x^2) equals the integral from 0 to 1 of 1/(1+t^2) using the substitution t = 1/x

Show that the integral from 1 to infinity of 1/(1+x^2) equals the integral from 0 to 1 of 1/(1+t^2) using the substitution t = 1/x

09/22/19

#### Calculus Question

4.MOBILE INSTANT MESSAGING ACCOUNTS—Mobile instant messaging (IM) is a small portion of total IM usage, but it is growing sharply. The function𝑃(𝑡)=.257𝑡^2+0.57𝑡+3.9 (0≤𝑡≤4)gives the mobile IM... more

09/19/19

#### Three shoppers from the survey are selected at random, one at a time without replacement. What is the probability that none of the three shoppers purchased office supplies?

An internet research company surveyed 95 online shoppers, each of whom made one purchase today. The company recorded the type of purchase each shopper made. Here is a summary.Type of purchase ... more

08/22/19

#### What is -3.1p+ 2(4.3p - 8.8)

What is this answer to -3.1p+ 2(4.3p - 8.8)

08/06/19

07/30/19

#### Do the data provide sufficient evidence that a greater proportion of those with a college education are satisfied in their work?

The table shows the number satisfied in their work in a sample of working adults with a college education and in a sample of working adults without a college education. Assume that you plan to use... more

07/26/19

#### Sampling Distributions

In a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA Today, March 2, 2009) You have been hired by the Bureau to investigate complaints this year... more

04/19/19

#### not sure how to formulate this

In the US the percentage of adults who have had an appendectomy is 28%. A simple random sample of 42 adults and the US is taken. Calculate the probability of the proportion of adults who have had... more

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