Mathematics

Can anyone help me with this pre algebra promblems please

The teacher asks that students with birthdays from July to December go to the chalkboard to work the next problem. A. convenience B. stratified C. random D. systematic Identify the sampling method us

How to solve this integral

dx/(1-sinx)-multiply top and bottom by (1 + sin(x) ∫ (1 + sin(x)) / (1 - sin^2(x)) dx = ∫ (1 + sin(x)) / (cos^2(x)) dx = ∫ sec^2(x) + sin(x)/cos^2(x) dx ∫(sec^2(x) + sin(x)/cos^2(x) dx) = ∫(sec^2(x)

Please help me with law of cosine and sine

Find the value of a. http://curriculum.kcdistancelearning.com… Find the value of a. http://curriculum.kcdistancelearning.com…-first one using cosine law a^2 = b^2 + c^2 - 2bc cosA = 25 + 64 - 2*5*8 c

Cubic question please help

Find a cubic function whose graph touches the x-axis at x=−4, passes through the origin and has a value of 10 when x = 5. The answer is y = 2/81x(x + 4)2 Please show some working-touches the x-axis at

Evaluate the following indefinite integral: ∫ ((x) / (1 + x^4))dx

Evaluate the following indefinite integral: ∫ ((x) / (1 + x^4))dx Any and all help is much appreciated! Thanks so much in advance!-Hint:let u = x^2, then du = 2x dx-Thats what happens when I attemp

Y=x^2 -x -6 quadratic function

y=x^2 -x -6 this is the function. The exercise is to find the culmination points, zero points, cutting point with the ordinate axis and plot a graph. I understand these: - Culmination point, you use t

Multiple choice question on research & hypothesis

Is the mean age at which American children can first read now under 4 years? If the population of all American children has mean age of μ years until they begin to read and standard deviation σ years,

Help with dividing polynomials in these two problems please?!

I need to use long division to do this. I actually want to learn how to do this, I dont just want the answer. Can someone please explain step by step with long division how to do these? Thank you! Btw

Percentage points of the normal distribution ~ statistics

I am meant to find the value of a in P(Z So I looked in the table of normal distribution function for 0.9990 in P(Z However, the book requires you to do 1-0.9990 = 0.0010 and using the percentage po

Please help with this mean & standard deviation problem??!

Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 50 and the standard deviation is 5. There are 45 students in the class. If an exam paper if selected at ran

Maths Combinations & Permutations

Hi, im a bit confused over the steps used to solve the following question. How many bit strings of length 8 are there where the `1 bits are not next to each other? Shouldnt the answer be 4! * 9C5 *

Please help show all steps

Essay; show all work. A simple dartboard has three areas… the main board has a radius of 9 inches, there is a circle with a radius of 5 inches, and the bullseye has a radius of 3 inches. What is the p

How to get this number

can somebodytell me or show me how to get 666 from(213)555 - 0100.-Add 213 and 555 and then subtract 0100 and then subtract 2 more xD-You cant. Its not possible.

Is this relation a function: ( - 1, - 2 ), ( 4, - 2 ), ( - 3, - 2 )

a.) Yesb.) No-Yes-Yes. If you plot these points, they pass the verticle line test

Derivative and Ring Question

let f(x) be an element of R[x].If f(a)=0 and f(a)=0 [f(a) is the derivative of f(x) at a], show that (x-a)^2 divides f(x). I set f(x)=(x-a)g(x) for some g(x) in R[x].Took the derivative and got an an