Recent content by Cyannaca

Is there a mathematical formula I can use that will give me 91%? I get this answer by drawing a tree of possibilities and MxN gives me 49%...

Hi, I'm taking a distance learning course in statistics so there are a few concepts that are not clear to me. First I was wondering if it was possible to add up Z scores. I have a problem in which two students have two different z scores on two exams. Peter has 1,69 on the first one and -0,13...

Thank you!

Ok so I have a problem I am not sure of the method I should use. In a recent survey, 60% of the population disagreed with a given statement, 20% agreed and 20% were unsure. Find the probability of having at least 5 person who agree in a mini-survey with 10 people. I tried to caculate the...

Hi, I would need help with this problem. A beam of light (628 nm) passes through 2 parallel slits in a screen, forming a pattern in which the interfringe is equal to 0,5 cm. If the distance between the slit and the screen is equal to 2,4 m, what is the distance between the slits? The...

Thanks for the help but now I have another question. This is probably stupid but I can't figure out why I get exactly the double for question a. I get 0.49m and the pulsation is equal to 2pi.

I would really need help on these questions. A mass is on a piston that oscillates vertically describing a S.H.M. T= 1s. 1-At which amplitude does the mass comes off the piston? The answer is supposed to be 25 cm but I don't know how to find the position of the mass when it comes off the...

I found ker T and I am T and I'm still stuck. I know it's not the inverse operator but I still don't know how to find the rule for the linear operator S.

Let T: R^3 -> R^3 be a linear operator and T(x;y;z)= (x -y + 3z;2x-y+8z;3x -5y+5z). Find the rule, for the linear operator S: R^3 -> R^3 such that ker S= I am T and I am S=Ker T. I'm not really sure how I should start this problem. Also I would like to know if I can assume S is the...

Yes, they mean row space. Sorry, I translated it from French a bit too fast I guess. Actually, I have to find the value of x so they have the same row space but I don't know how.

W3 is equal to v3 -4v1. I typed too fast. But anyway, thanks for your help I finally understood the problem.

Consider the matrices A= (1 5 -3) (2 x -3) B= (1 3 -1) (3 x -1) Find x so A and B have the same line space. I tried to do this problem but I was stuck with A= (1 (x-5) 0) (0 (x-10) 3) B= (1 3 -1) (0...

I would really appreciate if anyone could help me with this problems. V is a vector space on R and v1, v2, v3 e V are linearly independant. If w1 = v1 + kv2, w2= v2 - 2kv3 and w3= v3 - 4kv, find k so w1, w2, w3 are linearly dependant. I tried it and got k=0 and I think it's wrong :mad:

I would really appreciate if anyone could help me with this problem. F is a group homomorphism from G= (E, *) to H= (F,#). If , for all x e E , x*x e ker(f). Show that for all x e E, f(x-1)=f(x) Now I don't know how I should start the proof. Also, I would like to know if I can assume...

A electric circuit is made of a resistance, a solenoid and a power source. Resistance, V= Ri Solenoid, V = L (di/dt) Power source, tension E(t) Hence, L(di/dt)+ Ri = E(t). If E(t)= 20sin(5t), if L= 4 henrys and R= 20 ohms. If the intensity equals 0 at the beginning, find the amperage of...