Mathematics

Back again, help with another problem

The population of a city (in millions) at time t (in years) is P(t)= 2.2 e^{0.008 t}, where t=0 is the year 2000. When will the population double from its size at t=0? first correct answer gets bes

If x = 10 m, BC = 80 m, α = 10°, what is β

It seems that Ive been recently acquainted with the more difficult parts of Trigonometry. T_T Please help me out? If x = 10 m, BC = 80 m, α = 10°, what is β? Here is the image: http://i53.tinypic.co

Can anybody help me with math my math? Please!

The pet store has dog bones that sell for $3.50 a pound and pig ears that sell for $2.00 a pound. Write an equation that represents how much of each type of dog treat can be bough with $9.-3.5x+2y = 9

Major Statistics Help Please

Alright, Im in AP Stats, and tomorrow we have a test on z-scores, distribution, density curves, normal curves, and percentiles, etc. etc What I dont get is, how is a normal curve laid out? like I don

Directional Derivatives

Find the directional derivative of f(x,y) = sin(x+2y) at the point (-3, 2) in the direction theta = pi/6. So: gradient f = gradient f(-3,2) = What I am stuck on is the theta. I need to find the

Please help!! infinite sequences and series...

the equation: summation sign (upper limit:infinity, lower limit: n=1)1/n^2=1/1 + 1/4 + 1/9 + 1/16 + 1/25...=pi^2/6was established by euler. a) use this formula to evaluate the sum of the even terms,

Statistics help. how to find average number

you have received a few used parts from a dealer. many have components missing. what is the average number of components missing? given the following table... components missing: Number of parts 0: 3

Find the slope of a straight line that passes through the point (-2,0) and is tangent to the curve y = √x

y = 1/(2√x)-y = √x √x => x≥0 m=y`=1/[2√x] y-0=m(x-(-2)) y=m(x+2) √x=m(x+2) √x=[1/[2√x]](x+2) 2|x|=x+2 |x|=x , x≥0 2x=x+2 => x=2 m=y`(2)=1/[2√2] => y=m(x+2)=(x+2)/[2√2] y=(x+2)/[2√2] http://www.wol

How do I convert angles to radians

I know how to convert angles from 0-180 from degrees to radians (pi/2, pi... etc) but I do not know how to convert angles bigger than 180. Examples are 225 degrees, 450 degrees and -225 degrees. Can s

Inequalities question help me please...

modulus 2x-1 -|2x−1| |2x−1| × |1−2x| |(2x−1)(1−2x)| |−(2x−1)(2x−1)| |−1| |(2x−1)²| (2x−1)² −1 0 0

How do I do this algebra problem

Solving for x x/a+b=c-to solve for x you want to get x by its self on one side. so:x/a + b = csubtract b from both sides x/a = c - bmultiply a to both sides x = (c - b)aanswer hope you can follow

Math HELP please! I really need help!!

Consider r(x) = (2x-7) / (4x-6) a)Find and simplify: r(r(x)) b) Find and simplify: r^-1(x) c) Verify that r(r(x)) = r^-1(x) Please help me. I am really stuck and I cant find help any other way. Pleas

MATHS HOMEWORK HELP FOR 10 POINTS!

Locate the corners of an equilateral triangle if the difference of the corners 15 degrees is. There are two answers: 50 degrees, 65 degrees, 65 degrees and: 55 degrees, 55 degrees, 70 degrees Both a

The math question?? help

This is a division question, 1. - 2 - 4 [ -2 (2) (-2) -4 (-2)]-------------------------------------5 - 2 [ -7 -2 (-2)]-1. - 2 - 4 [ -2 (2) (-2) -4 (-2)] -------------------------------------5 - 2 [ -

Simplifying radicals

(√ 12*√ 3)^2=-There is a radical rule you should apply here that will make this easy. Whenever you have product to a power you can distribute that power to each factor. example: (xy)^2 = x^2y^2 with