In the same line of reasoning, why does the square root of (x^2) yield ONLY x and not -x and x?]]>

I'm a yr 10 student at school and I have 1/2 yearly exams coming up this week and I'm having troubles with two study questions as I cannot recall how to solve these or if my attempted answers are correct at all (they're probably not).

I was wondering if anyone would know the solutions and explain to me how to best solve these in general and...

Need Help With Surds/Algebra Questions]]>

Can someone help answer this question..

Please..]]>

I am trying to draw a hexagon pattern for a game I want to make, and I haven't been able to find a program that will run on my slow computer, but I just want measurements that I can draw on a sheet of paper, like x,y coordinates, that when I connect the dots it will draw a series a perfect Triangles and then I can just trace my lines where the hexagons are. I also want the lines so that the...

Help me draw hexagons.]]>

Infinity, limits and mollwollfumble's hypothesis]]>

One brother decides to move into Apartment A. Second brother decides to move into Apartment C. Third brother decides to move into Apartment D.

The brothers now only receive money from...

Sharing Money Fairly]]>

I knew from working out A and B that the distance between R and Q was sqrt of 265. But I couldn't figure out how to find the coordinates of R without knowing at least one of them and didn't know how to get that info from what had been given or what had been derived (distance between P and Q, and midpoint) but I tried to do it the hard way because I think that is how the author wanted it done...

how to do this without cheating?]]>

answer:

soh cah toa

sinB = O/H = 8/17

cosB= a/h= 15/17

tanB= o/a= 8/15

please check answers

thanks]]>

- One box contains all white balls, one all black balls, and one a mix of black and white balls.
- Each box is labeled, but all the labels are wrong.

Shown in the diagram is a white cue ball below a shaded object ball. The...

Formula for Angle Range of Equal Circles Colliding?]]>

So I was on the BBC bitesize website revising/researching inequalities. I clicked the test section and came across a questions which got me confused.

Question: -2x < 7

Answers:

1)

2)

3)

Immediately I was confused I thought you had to get the x value on its own so I took -2 away from boths sides and got X = 7 obviously this was wrong so I...

Inequalities Help]]>

a) calculate the GDS ratio and TDS ratio

b) you are considering moving to larger home and taking on abigger mortgage. are you in agood financila positio to do this? explain.

PLEASE HELP

THNANKZ]]>

150 - 150c

Thanks in advance!

I have to solve the following task with predator-prey method.

The dynamics of self-regulating "predator-prey" populations in the population is described by the model:

dN1/dt = (a - bN2 - αN1); dN2/dt = (-c + mN1)N2 (1),

where α is coefficient of internal victim struggle,

and a>0,b>0,α>0,c>0,m>0

With this change N1=k1x, N2=k2y,t=k3z (2) the system (1) can be reduced to: dx/dz=x(E - Ax - y); dy/dz=y(-1 + x) (3)

And here is the questions:

1)Find the coefficients ki of element (2)...

Predator-prey system]]>

We know that the common solutions of two inequalities belong to [-3,-1).

So if two numbers r_1 and r_2 are also solutions to the above inequalities then prove that r_1-r_2 belongs to (-2,2)]]>

Apologies is this not in the right place

I am after some help getting a what seems a fairly simple formula. I want to show heart rate on a 360 angle dial. I guess the problem is I want to be able to adjust the lowest and highest value depending on results.

Initially I think 0 degrees should equal 30 bpm and 360 should equal 220 bpm. (30 = 0 degrees) and (220 = 360 degrees)

I could just multiply the value by say 0.1 to achieve a fairly acceptable result but I would like to adjust my...

Formula needed]]>

]]>

I am curious to calculate this for 3 people, which I understand is

I have found many websites that discuss solutions for this problem but they really...

How many people are needed for a 50% chance that 3 have the same birthday?]]>

My Posting Plans]]>