01/11/21

The temperature of a roast varies according to Newton's Law of Cooling: dT dt equals negative k times the quantity T minus A , where T is the water temperature...

The temperature of a roast varies according to Newton's Law of Cooling:  , where T is the water temperature, A is the room temperature, and k is a positive constant.If a room temperature roast... more

11/18/20

Calculate the test statistic

Biologists researching the effects of adding limestone sand as buffer for acid rain effects in streams monitored the pH levels of two streams each month for 36 months. The first stream had a mean... more

08/06/20

The region bounded by the given curves is rotated about the specified axis. Find the volume of the resulting solid by any method

x = 1 − y4    x = 0,     about the line x = 9

04/24/20

Finding the Formula for a Polynomial

The polynomial of degree 3, P(x), has a root of multiplicity 2 at x=3 and a root of multiplicity 1 at x=−3. The y-intercept is y=−2.7.

04/23/20

How to solve this

Find the distribution function for above exercise. Recall that the density functions of above exercise is f (x) =C(4x −2x2), 0<x <2 0, otherwise

04/06/20

What is the probability that the test result is correct?

A device tests whether each light on a string of LED lights is functioning properly. A company estimates that 2.3% of LED lights that they produce are defective. The device is 96% accurate for... more

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?

11/17/19

Pre Calculus Hyperbola Question

The sides of a nuclear power plant cooling tower form a hyperbola. The diameter of the bottom of the tower is 319 feet. The smallest diameter of the tower is 185 which is 380.5 feet above the... more

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

02/27/19

A certain forest covers an area of 3500km^2

A certain forest covers an area of 3500km2. Suppose that each year this area decreases by 8.75%. What will the area be after 8 years? Round your answer to the nearest square kilometer.

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