Roman C.

Math Equations

04/30/13

Factor. x(x+2)-7(x+2)

Select the correct choice below. (a) x(x+2)-7(x+2)= (b) The expression is not factorable.

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Complete The Square Math Equations

04/29/13

How to do solving equations by completing the square?

The problem is a squared-2a-8=0 I do not know how to do this because I was absent. My teacher told me the answer, which is (4,-2), but I do not get how to solve it! Please help

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Math

04/29/13

Show that:

(a-b)(a-b+c) = (b-a)(a-b+c) (b-a)(c-b)(d-c) (a-b)(b-c)(c-d) Can this be proven? My opinion is that the part in bold is incorrect. Please verify. Thank-you!

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Science

04/29/13

why is the earth closer to the sun during our winter in the northern hemisphere

my teacher said this was the wrong answer but she never taught us that it was like that she says we are farther away because the axis is pointed away from the sun!!!

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Math Equations

04/26/13

Determine rather the expression is a polynomial.

If it is, state how many terms and variables the polynomial contains. Than state its degree.

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Curve

04/25/13

Find the curvature of the curve of intersection?

Find the curvature of the curve of intersection of the cylinder x^2+y^2=16 and the plane x+z=5 at (4, 0, 1).

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Math

04/24/13

Let k(x) be the curvature of y=ln(x) at x.

Let k(x) be the curvature of y=ln(x) at x. Find the limit as x approaches to the positive infinity of k(x).

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Fractions

04/23/13

how do I determine when the negative sign will be to the left of the entire fraction or next to the numerator or denominator

How do I determine when the negative sign will be to the left of the entire fraction or next to the numerator or denominator? REVIEWING FOR PRE-ALGEBRA

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Curve

04/23/13

Find the curvature of the curve?

Find the curvature of the curve r(t)=(t+1)i+2(t^2-1)j+(t-2)k. r'(t)=i+4tj+k sqrt(1^2+(4t)^2+1^2)=sqrt(2+16t^2) r''(t)=4j r'(t)xr''(t)=? Please show your work step by step from here to get the... more

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Arc Length

04/22/13

What's the arc length for the curve?

What's the arc length for the curve defined by r(t)=3sin(t)i+3cos(t)j+4tk for 0<=t<=10? (Answer: 50) r'(t)=<3cost, -3sint, 4>

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Algebra

04/22/13

I am so confused ono how to answer this queston and explain the what the answer really is?

7 x (-6) x 5 x(-4) x 3 x (-2 x 1 x 0 =

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Simplifying Radical Expressions

04/20/13

simplify 2 divided by 8 - the square root of three

i need to simplify the equation 2 divided by 8- the square root of three.

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Math Combinations

04/19/13

a binary digit or"bit" is either 0 or 1. a nybble is a four bit sequence. how many different nybbles are possible?

Combinations I need help with this math problem!!!

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Math

04/19/13

If f(x, y, z)=sin(3x-yz), where x=e^(t-1), y=t^3, z=t-2, what's df/dt(1)? df/dt=(df/dx)(dx/dt)+(df/dy)(dy/dt)+(df/dz)(dz/dt) (3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2) +(cos(3x-y))(1) What should... more

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Inequality Graphs

04/19/13

How do I Graph the system of inequality

How do I graph the following x + y > 2x - y < 2

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Equations

04/14/13

True or False? The integral from 0 to 2pi?

True or False? The integral from 0 to 2pi, from 0 to 4, from r to 4 dz dr dtheta represents the volume enclosed by the cone z=sqrt(x^2+y^2) and the plane z=4.

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Algebra 2

04/13/13

How do you find the zeros of a function and the multiplicity of the zeros?

The problem is y= x(x-1)^3

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4 x 0 = 4 x 0 = ?

04/10/13

negative 4 multiplied by positive zero = ?

-4 x 0 = ? negative four multiplied by positive zero equals what ?

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Math

04/10/13

what does 87.48 round up to?

A.90 B.86 C.87 D.88

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Stokes' Theorem

04/09/13

Use Stokes' Theorem to evaluate the line integral?

Use Stokes' Theorem to evaluate the line integral where F=<(x^2)(e^x)-y, sqrt(y^2+1), z^3> and where C is the boundary of the portion of z=4-x^2-y^2 above the xy-plane. The curl is <0, 0,... more

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Calculus

04/05/13