Thursday

August 28, 2014

August 28, 2014

Total # Posts: 33

**Precalculus**

Let z and w be complex numbers such that |2z - w| = 25, |z + 2w| = 5, and |z + w| = 2. Find |z|. I need a little help with absolute values on complex numbers.
*August 16, 2014*

**Complex Numbers**

The system of equations |z - 2 - 2i| = \sqrt{23}, |z - 8 - 5i| = \sqrt{38} has two solutions z1 and z2 in complex numbers. Find (z1 + z2)/2. Im really just plain old confused. Could anyone help me out?
*August 13, 2014*

**Precalculus**

Find the complex number z that satisfies (1 + i)z - 2 overline{z} = -11 + 25i. Im not sure how to solve this. I tried distributing the z out first but im still confused on this problem.
*August 13, 2014*

**Precalculus**

Let a and b be real numbers. The complex number 4 - 5i is a root of the quadratic z^2 + (a + 8i) z + (-39 + bi) = 0. What is the other root? I tried working this problem and so far I got that (a+8i) - (4-5i)= (-39-bi)/(4-5i). Im not sure how to solve this problem.
*August 13, 2014*

**Algebra**

What do the two terms have in common? Absolutely nothing except for 1. Therefore your answer should be 1.
*August 9, 2014*

**Precalculus**

Let S be the set of points {(r, theta): 2<=r<=6, pi/3 <= theta<= 5pi/6} Find the area of S. Im having trouble with this problem and have been stuck on it for a while. Any help?
*August 9, 2014*

**Precalculus**

For both theta = pi/2 and 3pi/2, r = 2. Does this mean that its only half an ellipse?
*August 9, 2014*

**Precalculus**

The graph of 4/(2-cos(theta)) forms a closed curve. The area of the region inside the curve can be expressed in the form k \pi. What is k^2? So I tried this problem and I got it to be an ellipse 1 = (((x + 8/6)^2)/((16/3)^2)) + ((y^2)/4)) Is this correct?
*August 9, 2014*

**Precalculus**

Suppose that the point (rho, theta, phi)= (12, 2pi/3, 5pi/4) in spherical coordinates can be expressed as (x, y, z) in rectangular coordinates. Find x+z. I first found x by using the conversion method (r*sin(theta)cos(phi)= x ) I got -3(sqrt(6)). Then I found z using (z= r*cos...
*August 8, 2014*

**geometry**

RECTANGULAR ARRANGEMENTS OF NO 12 AND18
*June 28, 2014*

**maths**

(√7+√5)(√7-√5)
*May 26, 2014*

**Radioactivity**

A bone fragment has lost 75% of its original carbon-14. What is the age of the bone fragment? My answer is about 11 000 years but I don't know if its right
*April 21, 2014*

**math**

In English Class, after studying a book called \The Lord of the Flies" by William Golding, students are split into 6 groups and each group is required to make a fi lm based on one of the 8 important scenes in the novel. Each group can choose which scene they are creating ...
*April 2, 2014*

**Chemistry**

Br2(l)+Cl2(g) (double arrow) 2BrCl(g) dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right, or unchanged and why? a.Increasing Temp. b. Increasing pressure in flask by adding Ar. c. Increasing volume of flask d. Adding Br2(l)...is answer ...
*February 12, 2014*

**english**

Many schools experience disruptive and anti-social behaviour, sometimes on a daily basis. Imagine that you attend the school at which Mrs Rodriguez is the Headteacher. Mrs Rodriguez has decided to tackle bad behaviour at your school. Recently there have been some very serious ...
*November 7, 2013*

**math**

TODAY
*May 29, 2013*

**science**

How is molecular formula and emperial formula related
*May 21, 2013*

**Geometry**

520
*May 15, 2013*

**Physics**

A man cycles up a hill whose slope is 1in20. If themass of the man and the cycle is 150kg and the man covers a distance of 100m along the incline, calculate the work done by theman.
*November 27, 2012*

**elocution**

i want essay for college perpose
*November 27, 2012*

**Physics**

A stream of water flowing horizontally with the speed of 15m/s gushes out of a tube of cross-sectional area 10-2m2 and hits a vertical wall nerby. What is the force exerted on the wall by the impact of water assuming it does not rebound?
*August 20, 2012*

**Physics**

A ball of mass 200g strikes a rigid wall normally at the speed of 25m/s and bounces with the same speed. Time of contact of the ball with the wall is 1s. calculate the change in momentum and the force exerted by the ball on the wall?
*August 20, 2012*

**physics**

a particle is dropped under gravity from rest from a height and it travels a distane of 9h/25 in the last second. Calculate the height h?
*August 20, 2012*

**Physics**

A car moves along a circular track at 60 kmph. If the radius of the track is 300 m, calculate the acceleration towards the centre
*August 11, 2011*

**Physics**

How much work is done to move a 1400 kg car from rest to 25 m/s.If this takes place over a distance of 130 m, what is the average net force?
*July 23, 2011*

**science**

the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10
*July 4, 2011*

**science**

the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10
*July 4, 2011*

**science**

the volume of nh3 at stp needed to pass into 30 ml of 1N h2so4 solution to bring down its strength to m/10
*July 4, 2011*

**Physics**

During a baseball game, a batter hits a pop-up to a fielder 82 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 6.9 s, how high does it rise? Answer in units of m.
*February 21, 2011*

**math**

Draw a triangle ABC with BC=8cm,angleB=50degrees and angleA=50degrees.A lso bisect it.
*January 23, 2011*

**social studies**

explain briefly factors which lead to enclosures in england
*January 11, 2010*

**chem.**

Ok, so far this is what i've done. A. to get moles of NaOH, i multiplied 0.5062M x 0.01658L=8.39x10^-3, then i divided this number by .010L, i got .8392M B. (8.392x10^-3)x(60.052g HC2H3O2)=.5039g, after this part i got stuck.
*March 7, 2008*

**chem.**

A 10.0 mL of vinegar, an aqueous solution of acetic acid (HC2H3O2), is titrated with .5062M NaOH, and 16.58mL is required to reach the equivalence point. A. What is the molarity of the acetic acid? B. If the density of the vinegar is 1.006 g/cm^3, what is the mass percent of ...
*March 7, 2008*

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