Mathematics

How do you answer this maths equation

How do you answer this question: when 2x-4 is substituted for y in the equation 11x-5y=3 what is the value of x. I really need to know how to do this for an exam next week please help thanks.-11x-5y=3

For what value(s) of k is the inequation x^2 – kx + 2 >(or equal) 0 true for all values of x

(a) For what value(s) of k is the inequation x^2 – kx + 2 >(or equal) 0 true for all values of x? (b) For what value(s) of n is the inequation x^2 + 2x >(or equal) 2n true for all values of x? Pleas

Sum of two numbers is 17, and sum of their squares is 185, what is the number

Suppose that the sum of two numbers is 17, and the sum of their squares is 185. Please help me find the numbers and thank you!-x + y = 17 x² + y² = 185 y = 17 - x x² + (17 - x)² = 185 x² + 289 - 34x

How to prove x + square root(x²+1) > 0

sqrt(x^2+1) is positive for all real x and is >sqrt(x^2)=|x| so x+sqrt(x^2+1)>x+|x| Even if x is negative x+|x|>=0 so result follows. Note that if you start from the hypothesis and get a true result

Whats root 4 in root 3 of 2c

http://img847.imageshack. us/img847/2935/18136013.png (connect the imageshack with us/img) how do I attack this little monster? Root of 4 INSIDE a root of 3 and in that is a 2c so what the hell is

Implicit Derivative Equation

Find the slope of the tangent to the curve x^2 + xy + y^2 = 7 at (1,2). I got that the derivative was -(2x+y)/(xy+2y), then I plugged everything in and got -4/6, but Webwork is telling me its wrong.

Algebra problem, possible to answer using only the math tools in algebra

Translated from Swedish: The square of x is 12 more than x itself. The cube of x is 9 times x itself. What # is x ? So I made these equations but I just couldnt manage to solve an x value that can b

Is √a²÷∛3 positive or negative (a≠0)

Positive root of a-square yields absolute value of a. So, what do you think the answer is? ;) Edit: @CitizenX, Thats a positive root. =.= youre thinking of a-square=4, giving +or- roota.-It could be

Finding the determinant of a matrix by adding multiples of rows to another

If a 4x4 matrix A with rows v1 , v2 , v3 , and v4 has determinant detA=−4, then what is the det of: 4v1+6v4 v2 v3 6v1+6v4 can someone help me with this? I thought it was -4, but I have tried to

Prove the identity sinx + tanx = tanx(cosx + 1)

I tried to prove each identity but Im not sure if there right 1) sinx + tanx = tanx(cosx + 1) LS = sinx + tanxtanx(cosx + 1)= sinx + (sinx/cosx)= sinx/1 + cosx Not sure what to do next? 2) tanθ - 1

Is this true??????????????????????

1) Sqrt(2) + sqrt(2) = irrational. This is true right? 2) Sqrt(2) - sqrt(2) = rational, because the answer is 0 and 0 can be expressed at a/b, where a and b are integers and b DNE 0. I think the firs

Is this function f(x) = 1 even or odd

is this function f(x) = 1 even or odd?-f(x) = 1 is a straight horizontal line. Even functions are symmetrical across the y-axis Odd functions are symmetrical across the x-axis Since it is a straight h

Hypothesis statistics question

The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 of her dogs, they ran,

What is Pi? I'm not quite sure.

What is Pi and why does it taste more like a number than a food? Also, why do people keeps stealing it off my open window ledge???? WTF PEOPLE?-π (sometimes written pi) is a mathematical constant that

NEED HELP EASY MATH please

hi i need help on this i dont know how to set it up... your family went out for breakfast. the bill was $35.40 and you want to leave a 15% tip. what was the total bill including the tip? so to set i