# extremely

1. ### I extremely need help with the codes for this MATLAB project

I need help with this project in MATLAB 1. Represent while marking on the axis the significant values for the signals x1(t), x2(t) and x3(t) for 10 periods, 20 periods and 40 periods. (you should use the vectorial method). x1(t)=10t^2-8t+14 for t included in the domain [o;30] [ms]...
2. ### I extremely need help with the codes for this MATLAB project

1. Represent while marking on the axis the significant values for the signals x1(t), x2(t) and x3(t) for 10 periods, 20 periods and 40 periods. (you should use the vectorial method). x1(t)=10t^2-8t+14 for t included in the domain [o;30] [ms] x2(t)=x1(t)*dirac_T1(t); *=convolution; T1=30...

Suppose a large set of islands have turtle populations that are approximately normally distributed with a mean population of 2100 per island and a standard deviation of 52.3. Suppose we take a simple random sample of 10 islands. a) Find the probability that at least 4 of those islands from the...
4. ### extremely confusing vector addition problem

1. The problem statement, all variables and given/known data Suppose a plane flies at a constant groundspeed of 500 miles per hour due east and encounters a 50 mile-per-hour wind from the northwest. Both the airspeed and the compass direction must change to for the plane to maintain its...
5. ### Newton's law of cooling, who died first? Extremely hard

Two bodies have been found. The wife was found dead inside the heated home where the temperature was maintained at 22 degrees celsius. The husband dragged himself outside, where the outside temperature during the preceding day was 8 to 12 degrees celsius. The doctor took the temperatures of the...
6. ### Extremely difficult integration

A partical is thrown vertically at a velocity of n. The resistance of the particle is equal to it's velocity squared. Find the velocity as it returns to its point of projection in terms of g, k, and n. Now, even though my lecturer has moved on from this unit the question is still bothering me...
7. ### Extremely easy percentages

If 15=200 25=??? My working: 15=100% 25=166.6% 200*166.6%=333.3 please confirm whether this is right
8. ### Extremely Hard Max/Min Problem

5. A chord joins any two points A and B on the parabola whose equation is y^2 = 4x. If C is the midpoint of AB, and CD is drawn parallel to the x-axis to meet the parabola at D, prove that the tangent at D is parallel to chord AB. I've attempted to graph the situation (attempted graph is...
9. ### extremely frustrating identity...

this one is giving me headache. I have tried maybe 7 tries and can not get close to what they want. express the fallowing in terms of a single function. sec \theta - tan \theta in terms of sin \theta . I can only use the elementary identities. Pythagorean Reciprocal Co-function even/odd...
10. ### Extremely difficult abstract problem...

"A point on the outside of the axle of a truck has a circular motion that can be modeled by a sine curve. If you measure the distance from the axle's center to the bottom of the truck bed, that distance remains constant as long as the truck on a level piece of road. If the truck goes over a...
11. ### extremely hard partial derivative question

solved thanks for the helppp
12. ### Extremely hard calculus question.

Extremely hard for me at least! This problem is just something I came up with. for practicing properties, and how to use partial. I just want to know if I did this right.. Sorry, but no one I know can do this stuff, not even the cal teacher at my higschool (Rofl). consider: t=x^{x^y} Find...
13. ### Extremely Simple Log Problem =D

How Would One Go about simplifying this ln(3x^2 - 9x) + ln(1/3x)
14. ### EXTREMELY Difficult Sequence Question!!!

What is the pattern linking the following sequences (each sequence has 25 letters in it) AND, if I were to tell you that the sequences (1),2),3),4),5) are in chronological order, can you predict the next one (i.e. what would row 6 look like?): 1) D E E C B B D D E E A A C B D C B E D C D A C A...
15. ### Extremely difficult induction proof problem

I dunno who thought up this one, but it is clearly for masochists. Prove that for all x > 0 and all positive integers n e^x>1+x+\frac {x^2}{2!}+\frac {x^3}{3!}+...+\frac {x^n}{n!} n!=n(n-1)(n-2)...3\cdot 2\cdot 1 This MUST be proven by induction on n\geq 1. In addition, these...
16. ### Extremely Simple Circle Probability Problem! :)

Extremely Simple Circle Problem! :) How many ways can 8 boys be arranged in a circle if 3 boys cannot sit next to each other? Well, I don't actually have the correct answer, but this is how I solved it: Total Ways the Boys Can Be Arranged - 3 Boys Sitting Together = Ways The 3 Boys Cannot...
17. ### Infinite sums help extremely needed

Problem 1 Evaluate ∞ Σ (1/n^2 + 5n + 6) n=1 And, Problem 2 Evaluate ∞ Σ (2^2n3^3n/4^4n) n=1
18. ### Extremely difficult number theory problem?

For a prime and a given integer let denote the exponent of in the prime factorisation of . Given and a set of primes, show that there are infinitely many positive integers such that for all .
19. ### Extremely hard minimization problem

This one is incredibly hard. I have absolutely no idea how to solve it. "A closed cylindrical can is to have a volume of V cubic units. Show that the can of minimum surface area is achieved when the height is equal to the diameter of the base." I've gotten as far as finding the derivative of...
20. ### Extremely difficult question on relative velocity?

A man is walking in the north-east direction and wind appears to blow from north. If the man doubles his speed, wind appears at angle arccot 2 east of north. Find the actual direction of the wind.