06/07/19

Sec 5.4 Problem 14

Find a function f and a positive number a such that 1+integral (top x bottom a) f(t)/t^2 dt=6x^(-3), x>0 a=? I know f(x)=-18x^(-2)

11/05/18

Ms. Wilson invested ​$23,000 in two​ accounts, one yielding 7​% interest and the other yielding 12​%.

If she received a total of​ $2,210 in interest at the end of the​ year, how much did she invest in each​ account?

The sum of two numbers is 15. If one number is subtracted from the other, their difference is 3. Find the numbers.

i need help with this problem can you help me?

06/20/18

Covariance of binomial distribution

Suppose X~ binomial (n, p). Then cov(X, n-X) is A. np(1-p) B.-np(1-p) C. np(1-p)² D.-np(1-p)²

06/20/18

Joint distribution

The random variable X and Y have joint distribution P(X=i, Y=j) =c(i+j), for i =0,1 ; j=1,2,3. (i) 1/6 (ii) 1/9 (iii) 1/12 (iv) 1/15

The coefficients of a, b, and c in the following quadratic equation are a = 1, b = 2, c = 1: x2 = 2x + 1 True False

need an asnwer asap, im so lost and cant continue on my work until i get this

If you know all 16 cofactors of a 4 by 4 invertible matrix A.

If you know all 16 cofactors of a 4 by 4 invertible matrix A, how would you find A? 

Let X: [0,1] being in all real numbers be given by X(x) = max{x-0.5,0}. Find the inverse images of all intervals [a,b]

Let X: [0,1] being in all real numbers be given by X(x) = max{x-0.5,0}. Find the inverse images of all intervals [a,b] Due to lack of examples related to the theory, I am unable to properly write... more

01/03/18

How to know if a subspace is a subspace

Given the following vectors in R3, that is: 𝑣1 = (1,2, −1), 𝑣2 = (0,1,1), 𝑣3 = (−1, −4,2) a. Find a basis, the dimension and Cartesian equations of the subspace generated by the above three... more

01/03/18

Show: If (P1 P2) is a permutation matrix, then (P2 P1) is also a permutation matrix.

how to prove Permutation matrix

01/01/18

Two consecutive integers have a sum of 95. What are the two numbers

im not sure how to solve this question can you please help

12/31/17

Matrix Permutation

Show: If(P1 P2)is a permutation matrix, then(P2 P1)is also a permutation matrix.

12/30/17

Permutation Matrix

Show: If P is a permutation matrix, then PT and PH are also permutation matrices.

12/29/17

f(x) = ax + b , f(ax + b) ) x +1 - what's a & b ?

Let f(x) = ax + b Pick numbers for a and b so that f(ax + b) = x + 1    

12/23/17

what speed is the shadow moving?

A street light is on top of a 10 foot pole. Mario, who is 6 feet tall, walks away from the pole at a rate of 4 feet per second. At what speed is the tip of Mario's shadow growing when he is 10 feet... more

12/13/17

Calculus help

Determine the following limit by either removing the “offending” factor or usingL’Hopital’s Rule:     lim x2+3x-28 x→4 x2-x-12

12/12/17

The ratio of girl to boy in mid jumpers class is 3:2 ,how many boy are there if there are 12 girls

The ratio of girl to boy in mid jumpers class is 3:2 ,how many boy are there if there are 12 girls      

12/12/17

rank of matrix 3 by3 order by solution

rank of ⌈0 2 3]            ι0 4 6ι            ⌊0 6 9⌋       

Express through p and q the sum of the squares of the roots of the equation x2+px+q=0.

 I need this asap because this is important

an object is moving at a speed of (3+sqrt(2)) ft/s. How long will it take the object to travel 20ft?

object moving at speed of an 3+sqrt(2)) ft/s

The value of x

The value of y is directly proportional to the value of x. if y = 35 when x = 140, what is the value of y when x = 70?

11/15/17

Find the value of r so that the line passes through the pair of points has the given slope. (-1,r), (1,-4), m=-5

I have no idea how to slove this problem out, ive beem working on it for an hour or 2 please help me out. So how can i figure this out step by step.

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