03/07/20

Multiple choice: Probability
A particular system is composed of three machine. A, B, and C. The entire system will work as long as any one (or more than one of the three machines works. (The system is WITH backup).P(A works) =... more
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03/05/20

How to find probability density function
I can't figure out how to solve for What is the probability of obtaining a standardized score less than or equal to 1.0 standard deviations from the mean?   P (z ≤ 1.0) =  Do I need to find the Z... more
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03/05/20

Two cars start moving from the same point. One travels south at 48 mi/h and the other travels west at 20 mi/h. At what rate is the distance between the cars increasing three hours later?
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03/05/20

Math word problem
There are nine cards from a deck in a pile on the table. Five of the cards are red cards, and four of the cards are black cards. The cards are face down and three of them are selected at random.... more
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03/04/20

Inverse Matrix Question
Suppose X and Y are both invertible matrices, and W is a block matrix: W = [ X Z ] [ 0 Y ] Show that W is invertible, and its inverse is:[ X-1 -X-1ZY-1 ] = W-1[ 0 Y -1 ]
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03/04/20

Inverse Matrices
Find the inverse of the following matrices if it exists: 1. [ 1 -2 ] [ -3 5 ] 2. [ -2 0 2 ] [ 4 -2 -1 ] [ 0 2 -2 ]
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03/03/20

If v= (2, 4, 4) and ‖ k v ‖ = 24, then the value of k is:
If v= (2, 4, 4) and ‖ k v ‖ = 24, then the value of k is:
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03/03/20

Linear Equations in 2 variables

Hi, this is the question that has me stumped the most. Solve for X and Y1/2x + 1/1 = 1y = 15/21x +1/9y = 67/9I believe the answer has no solution but I wanted to hear from you all.
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03/03/20

Find dy/dx by implicit differentiation. cos(xy) = 1 + sin(y)
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02/28/20

Find the projection of u onto v.
U = {3,6}v = (4,6)Options:a. 13{72,48}b. 1/13 {3,4}c. 13/12 {48,72}d. 1/13 {48,72}e. 12/13 {48.72}
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02/28/20

Select a linear combination of the standard unit vertore i and j of given initial and terminal points of a vector.
Initial Point = (-9,9)Terminal Point = (10,-10)
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02/27/20

Find the values of x on the curve y = cos x/(2 + sin x) at which the tangent is horizontal. (Let n be an integer. Enter your answers as a comma-separated list.)
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02/27/20

Calculus instant messaging account

Instant Messaging Accounts The number of enterprise instant messaging (IM) accounts is projected to grow according to the functionN(t) = 2.99t2 + 11.32t + 59.6    (0 ≤ t ≤ 5)where N(t) is measured... more
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02/27/20

Calculus question

A manufacturer has a monthly fixed cost of $28,500 and a production cost of $8for each unit produced. The product sells for $11/unit. Find the following functions (in dollars) and compute each... more
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02/26/20

A normal distribution has a mean of µ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 110?
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02/25/20

My question is about matrices.
Hello, i have a question. Suppose A is a 3*2 matrix, B is a p*q matrix and C is a 5*4 matrix. if ABC is defined then p and q is :1) p=2 and q=5 2) p=2 and q=43) p=3 and q=44) p=3 and q=5I... more
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02/24/20

Linear Systems Equation Solutions Questions
Determine how many solutions each of the following linear systems have:(a) 6x + 8y = 5 −2x + 9y = −6 (b) 5x + 2y + z = 4 −x + 8y + z = −2 (c) 2x − 3y = −1 3x + y = −4 x − 7y = 2 (d) x + 3y + 3z = 3... more
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02/24/20

Does Mean Value Theorem apply to the functions
Determine if the Mean Value Theorem for Integrals applies to the function f(x) = 5 - x2 on the interval  . If so, find the x-coordinates of the point(s) guaranteed by the theorem.Question... more
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02/24/20

Topic on Linear Algebra .
Which of the following statements is correct ? 1) The solution of 0x+0y = 0 is x= 0 and y= 0 2) (-1;2;4) is a solution of 2x+2y+2z = 10 and 2x-z = 2 please assist.
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02/24/20

Probability Question
100 cell phone batteries were tested for danger of overheating. 12 of those tested batteries were found to be defective. Two batteries are being randomly selected without replacement. Find the... more
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02/21/20

Abstract linear algebra

generalize the notions of external and internal direct sums to three or more summands.
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02/20/20

Probability Mass Function
Cards are selected at random and with replacement from an ordinary deck of 52 cards. Define the random variable X as the number of trials until we obtain the first ace. Give the probability mass... more
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02/20/20

The softball coach is determining the batting order for the nine-member team. The catcher and pitcher will bat 5th and 9th, respectively. How many batting orders can the coach form?
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02/20/20

How many different ways can a theatrical group select 2 musicals and 3 dramas from 11 musicals and 8 dramas to be presented during the year?
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02/19/20

Find the Volume

Use your calculator to find the approximate volume in cubic units of the solid created when the region under the curve y = sec(x) on the interval [0,] is rotated around the x-axis.Question... more
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