Mathematics

Problems with these algebra questions

Well I decided to test myself with some questions involving Algebra and I can not for the life of me figure out these problems. I would like to know if you an solve them for me, and I will be truly gr

Solve for x trig identities? help!

Solve for x sec^2πx = 4/π I dont understand this please help thanks!-sec²(πx) = 4/π Substitute 1/cos²(πx) for sec²(πx): 1/cos²(πx) = 4/π Multiply both sides by cos²(πx): 1 = {4/π}{cos²(πx)} M

Hard SAT math question

If m and n are integers and m = n - (2/n) - (2/n^2), then which of the following could be the value of m? i. -5 ii. -3 iii. -1 (A) ii only (B) ii and iii only (C) i and ii only (D) i and iii only (E

How do I subtract a percentage from an existing figure? such as 30% from 50

I am going into 6th grade and I want to be ahead, but really Ive got no clue how to do this. Please help in an easy to understand answer!!! Thanks!!!-First you need to calculate what 30% of 50 is. To

Graphing: help finding the vertices, center and foci of the ellipse.

Can i possibly get some help to find the vertices, the foci and the center of the following graph: (x+1)^2 /16 - (y-3)^2 /9 = 1...............?-This is not an ellipse:) Because of the minus sign, it

What does ≅ mean in math

in geometry it means that two shapes are congruent.-Congruence.-About/Approximately-equal-to.-about 4.99 ≅ 5

I cannot figure out these ALGEBRA problems(4) PLEASE HELP!!!!!!!!

1.Compute by using logarithms. 846 ÷629 =(the equal sign is supposed to be like this ~ but doubled(=), but I dont know how to do it on the keyboard.) 2. Compute by using logarithms. 4^√6 = 3. Solve

Trig Identity Homework Help

Im looking at a problem and Im stumped: (1-tan x) / (sin x-cos x) Im trying to reduce it down and cant figure out the trig identity to use to break it down. Any help?-(1-tan x) / (sin x-cos x) (1-

Wheel rolling along level ground - trigonometry

Okay, I have a question and i am completely stumped as to how to do it. A wheel is rolling in a straight line along level ground. The coordinates of a point P(x(t), y(t)) on the perimeter are given

Maths - Square root / power of 2 question

Okay, Im in grade 10 doing top maths. In the exam we had a month or two ago, one of the questions was: Write -4 as a power of 2 - the correct answer being of course -2² = -4. I got it wrong, because

What is the limit for {[x + sin3x]/[2x + sinx]} when x tend to 0

lim_(x->0) {(x+sin(3 x))/(2 x+sin(x))} Using the continuity of {x} at x = 4/3 write lim_(x->0) {(x+sin(3 x))/(2 x+sin(x))} as {lim_(x->0) (x+sin(3 x))/(2 x+sin(x))}: = {lim_(x->0) (x+sin(3 x))/(2 x+si

For mathlovers please help me In (3+4i)= ?????

In (3+4i)=??????????????????????????? please helpp meeeeeeeeeee-First, convert (3 + 4i) into polar form. r = √(3² + 4²) = 5 θ = arctan(4/3) = 0.9273 (3 + 4i) = 5(cosθ + i sinθ);where θ =arctan(4/3)

A rhombus of side 20 cm has two angles of 60 degree each. Find the length of the diagonals.

Here are two properties of parallelograms with which one need be familiar: (1) Opposite angles are of equal measure (2) Sum of interior angles is 360º ----- Visualize a rhombus (a parallelogram wi

It is a very easy question , who can solve it

Find x if sin(x+36^) = cos x Write your solution please-sin(x)cos(36°) + sin(36°)cos(x) = cos(x) sin(x)cos(36°) = cos(x) (1 - sin(36°)) tan(x) = (1 - sin(36°)) / cos(36°) x = arctan[(1 - sin(36°)

How do I find ∫(0,inf)∫(0,inf){y f(x,y)}dxdy, given the following f(x,y)

f(x,y) = exp( - (x^2 + y^2 - 2Rxy) / 2(1-R^2) ) (-1 Ive already worked out ∫(-inf,inf) ∫(-inf,inf){f(x,y)} dxdy = 2pi for R=0, and shown that ∫(-inf,inf){exp(-ax^2)} dx = sqrt(pi/a) for R=0 and a>0.