11/22/20

Let f be the function given by f(x) = 2 cos x + 3ex. What is the value of f'(0)?
Let f be the function given by f(x) = 2 cos x + 3ex. What is the value of f'(0)?A) -3B) 0C) 3D) 5
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11/21/20

You are given seven keys, and you know that one of them opens a treasure chest. 
2. You are given seven keys, and you know that one of them opens a treasure chest.     You try one key after another, in random order. What is the chance that you will open the chest on the first... more
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11/21/20

What's the degree of freedom for this question?
"The mean number of English courses taken in a two-year time period by male and female college students is believed to be about the same. An experiment is conducted and data are collected from 29... more
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11/20/20

Use this to predict the number of situps a person who watches 9.5 hours of TV can do.
The results of the regression were: y=a+bx b=-0.878 a=33.782 r2=0.588289 r=-0.767
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11/20/20

Hello help me solve this
in a class of 100 students 30 are in mathematics moreover of the 40 females in the class 10 are in mathematics if a student is selected at random from the class what is the probability that the... more
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11/19/20

Satisfying two equations in trigonometry
Suppose that x and y satisfy the equations 3 sin x + 4 cos y = 5 4 sin y + 3 cos x = 2 What is the value of sin(x + y)?
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11/19/20

Math algebra 2 What is the max height and seconds.
A A diver leaps into the sea from the cliff edge. His height from the water surface as a function of time is modeled by the following parabola:h(t) = -5t^2+5t+12. Determine how long in seconds... more
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11/19/20

Which expression should be set as u and what is the minimum number of applications of integration by parts that can be used to evaluate this integral?
Consider the integral ∫x2 ln(x) dx and the integration by parts method ∫udv=uv − ∫vdu + C. Which expression should be set as u and what is the minimum number of applications of integration by parts... more
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11/19/20

Where is f(x) = x2e−x not increasing?
Where is f(x) = x2e-x not increasing?Which of the following options is true?(-inf , 0] ∪ [2 , inf)(0 , 2) [0 , 2](-inf,0) ∪ (2, inf)
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11/19/20

Which matrix is not invertible?
1) 2 0 -1 3 1 0 3 3 3 2) 0 3 0 3 0 3 3 0 2 3) 1 0 0 0 1 0 0 0 1 4) 1 1 1 0 1 1 0 0 1
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11/19/20

Given the vectors u, v and w in R3, which of the following calculations could result in the answer 3?
Given the vectors u, v and w in R3, which of the following calculations could result in the answer 3? (u x v) • (v x w) u x (u - w) (u • v) (u + w) ||u + v|| w
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11/19/20

Which of the following expressions is not equivalent to sin2(x)?
Which of the following expressions is not equivalent to sin2(x)? 1+cos2(x) tan2(x)cos2(x) sin2(x) / sin2(x) + cos(x) sin4(x) / cos2(x) tan2(x)
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11/19/20

Which of the following definitions of g(x) and A would make f(x) continuous on R?

Consider f(x) be defined by the piecewise function. Which of the following definitions of g(x) and A would make f(x) continuous on R? f(x) = -2x - 2, x ∈ (- infinity, - 1 ) g(x), x ∈ A ... more
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11/19/20

What is the y-intercept of log10(x+4)+2?
What is the y-intercept of log10(x+4)+2
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11/14/20

Find probability
The faculty of a small eastern university is considering adding grade point average within a student's major to each transcript. You have been asked to sample students to determine student... more
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11/13/20

Help pls ? What is variance and standard deviation for the following simple frequency distribution collected
What is variance and standard deviation for the following simple frequency distribution collected from 18 college students as to the number of their friends, from 1 to 5, calculate the mean; mean... more
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11/12/20

Upon closer inspection of the graph...
Upon closer inspection of the graph, a table of data values for R′ and C′ (each in thousands of dollars per unit manufactured) is generated below: x: 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 R′... more
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R

10/05/19

Correct way to specifiy optional arguments in R functions?
I am interested in what is the "correct" way to write functions with optional arguments in R.Over time, I stumbled upon a few pieces of code that take a different route here, and I couldn't find a... more
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R

10/04/19

How to get a vertical geom_vline to an x-axis of class date?
Even though I found Hadley's post in the google group on `POSIXct` and `geom_vline`, I could not get it done. I have a time series from and would like to draw a vertical line for years 1998, 2005... more
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