Mathematics

Derivative of 8/x^2??????????????

I just want to know if I am doing it right.. and Im getting somewhat stuck 1) 8/(x+h)^2 - 8/x^2 all over h 2 )common denominators 8x^2/x^2(x^2+2hx+h^2) - 8x^2+16hx+8h^2/x^2(x^2+2hx+h^2) 3) come out w

What is the derivative of the sin(x)

cos(x)-Okay here are all the derivatives of those forms so you wont have to make a question about each: Derivative of: sin(x) is cos (x) cos(x) is -sin(x) tan(x) is sec^2(x) csc x = -csc x cot x

Tell Whether they are parallel, perpendicular, or neither

1) y= 4x + 7y= -1/4x- 3 2) y = 3x - 4y= 3x+ 1 3) y= x+ 5y= -5x - 1 HELP ME :D I know there are smart people out there >:T lol please.-1) perpendicular 2)parallel 3)neither if the slope is the sa

Why are 2nd derivatives written the way they are

When you differentiate dy/dx again, you get d²y/dx², and so on with 3rd, 4th etc. Why are the exponents in different places? Meaning, why isnt it d²y/d²x or dy²/dx²?-Im not 100% sure on this, but I be

Calculating half-life

The half-life of a certain radioactive substance is 48 hours. There are 20 grams present initially. a) Express the amount of substance remaining as a function of time t. b) When will there be 13 grams

Should I become a mathematician

Im a sophomore in high school. Im in pre-calulus. I really enjoy math theory, and I love math itself, in the abstract, but I really do not like writing down a bunch of repetitive equations over and ov

If Cheese is is twice the Fencepost, whats the denominator of the Lamp post

It depends on whether you live nearby or ride a bicycle, carry your dinner in a jug and board on a fence.-what if it isnt?

Help with math problem 10pts

At a college theater 400 tickets were sold. The ticket prices were $8, $10, $12. The total income was $3700. How many tickets of each type were sold if the combined number of $8 and $10 tickets sold w

Math problem... Please help!

y = -x^2 - 8x - 17 Please show your answers! Best gets 10 points! Thank you!-k just look at how troll ur question is...nuff said-what would you wanna., whats the question.,-man i wish i rmred how to

How do you solve lim x->4 for (h+2)^2-9h/h-4

this is a problem from my worksheet that i cant figure out how to simplify. also i cant figure out lim x->16 sqrt x -4/x-16*the square root is only for the x. Thanks in advance! (:-lim x->4 for (h+2

Matrix theory question, please help!

B= (4 0 1 1 0 1 1 3) C=(10362033) I need to multiply BxC. my lecture notes say that I must multiply the rows against the columns in C.I multiplied Row 1 of B against column 1 and 2 of C and Row 2 of

Maths: Factorise x^4 + x^2 + 1

_________________________ x⁴ + x² + 1 = x⁴ + 1 + x² = (x² + 1)² - 2x² + x²← Note: x⁴ + 1 = (x² + 1)² - 2x² = (x² + 1)² - x²← Notice that this is the difference of squares = [(x² + 1) + x]·[(x² + 1) -

Help with algebra 2 problem involving inequalities

http://sunnyhills.net/ourpages/auto/2011… #46 I have 296m_ btw _ thank you very much-You have not mentioned what is required in the question. But the 1st step done by you is correct.

What is the formula for the chain rule

f(x) = g(h(x))*h(x)-The formula for the chain rule is the following: Say f(x)=g(h(x)), then f (x) = g (h(x)) * h (x)

Can you find all the zeros of p(x)

c= 1 is a zero of P(x)= x^3 - 14x^2 + 53x - 40 find all the zeros of P(x) x1 =? x2= ? with x1-x^3 - 14x^2 + 53x - 40=0 (x-1)(x-5)(x-8)=0 x = 1, 5 and 8-If x = 1 is a zero of P(x), then (x - 1) is a