Mathematics

Simple linear algebra problems. will rate quickly

If A= 1 -2 -9 0 1 1 0 0 1 then a^-1 =? If A= -3 3 10 3 -2 -6 -1 1 3 then a^-1 =? A= 5 1 0 0 -11 -2 0 0 0 0 -1 -1 0 0 -4 -5 a^-1=? i seem to be having some difficulties understanding matrix in

Find value to make function continuous

Find a such that f(x) = 9x / tanx,x does not equal 0= aifx = 0 is continuous at x=0-9x/tanx F1 9x = 9 F2; tan(x) = sec(x)^2 F1(0) =0 F2(0) = 0. indeterminate case so we can useHospitals rule lim x

Number Pattern help? (two different patterns)

8, 12, ___, ___, ___, 60.75 second one: Describe the pattern and write the next 3 numbers: 1, 1.5, 1.75, 1.875(They ARE in fraction form on the w.s.)-First one: multiply by 1.5 each time, Second on

Geometric Series please help!!

Find Sn for a series with tn equal to each value: d)2^(n+1) Can somebody help me out :S-t[1] + t[2] + t[3] + ... + t[x] => 2^(1 + 1) + 2^(2 + 1) + 2^(3 + 1) + ... + 2^(x + 1) 2^2 + 2^3 + 2^4 + ... +

How to solve 33/22 = 6/k cross products, common numerators/denominators, equivalent fractions and lcd

Help!How to solve this problem all 4 ways-33........6 ***..=..*** 22.......X 3..........6 **...=...**...............cross products 2.........X 3X = 12 X=4 3..........6 **...=...**...............

Epsilon Delta Limit Proof help!

lim x-> 6(2x + 4) ^ 0.5 = 4 and lim x-> -1(-4x + 6) / (-3x + 2) = 2 help please im stuck on both proofs >_-1) Note that |√(2x + 4) - 4| = |√(2x + 4) - 4| * |√(2x + 4) + 4| / |√(2x + 4) + 4|, via

40x^3+60x^2+30x+5=y in terms of x

How do I write this as x=... etc.?How do I isolate x so that I can solve x for any given y?-y = 40x^3+60x^2+30x+5 = 5(8x^3 + 1) + 30x(2x + 1) = 5(2x + 1)(4x^2 - 2x + 1) + 30x(2x + 1) = (2x + 1)[5(4x^2

Why is x²+2 considered x+1 instead of x+2

2 square root is 2 not 1. if it was 4 then it would be 2². I dont get it.-What you have written makes no sense. Clarify, please. x^2+2 does not always = x+1 or x+2. If your book says x^2 - 2 = (x-1)(

What is the limit of sin x/7√x as x approaches 0

I hope I phrased it so its understandable...-Derivative of numerator = cos x Derivative of denominator = 7/2sqrt(x) Using lHopitals rule 2cos x*sqrt(x)/7 x-->0 = 2*0/7 = 0-edit: I was thinking sin (x/

Suppose that f(x)=(3/(8x^(3)))+(1/(8x^(5)))) . Evaluate each of the following:

f(3) = f(-2) =-f(x) = -[9/8x^4+5/8x^6]how you got derivative ,,,,,,so first rearrenge the given function as f(x) = 3/8 * (x^-3) + 1/8* (x^-5) f(x) = 3/8 d/dx (x^-3) + 1/8 d/dx(x^-5)= 3/8 *(-3)* (x^-4)

Help with some easy math

I had quick question regarding how I would calculate my grade. So technically, the test was out of 20, but since many of the students in my class, including myself did poorly, my professor decided to

Algebra Helllppp!!! Please I need help on 2 problem

slope= 8/7; (5,-3) ----------(4 points) A)–8x + 7y = –61 B)–8x – 7y = –61 C)–8x + 7y = 61 D) 8x + 7y = –61 Find the slope of the line.x = a ----------(4 points) A) a B) 0 C) undefined D) 1-The b

HELP ON ALGEBRA PROBLEM!

10 - d = -34 - 5d-10 - d = -34 - 5d 10 + 4d = -34 4d = -44 D = -11-D= -11

How to solve for integral of 2e^(2x)sin(e^(2x))

let u = 2x du = 2 dx = 1/2du ∫ (e^u)sin(e^u) x 1/2du 1/2∫ (e^u)sin(e^u) Aaaaand now Im stuck. XP Please help!-∫2e^(2x)sin(e^2x) dx This is a basic u substitution problem... u = e^2x du = 2e^2x dx

Trigonometry -A man walking in the desert walks 2.6 miles in the direction S 36* W

A mn wandering in the desert walks 2.6 miles in the direction S 36* W. he then turns 90* and walks 3.2 miles in the direction N 54* W. At that time, how far is he from his starting point, and what is