Mathematics

How to solve absolute inequality with negative signs? - |2x - 4| < -13

- |2x - 4| -multiply by -1 to clear the negative sign |2x-4| > 13 (note the direction of the negative sign reverses -13 > 2x-4 -9/2 > x 2x-4 > 13 2x > 17 x > 17/2 x in (-inf, -9/2) U (17/2, inf) or

How do i solve this math problem? (algebra)

Solve for u -1/u+2=7/3u+6-3--1/u+2=7/3u+6-3; multiply each side by u to get -1+2u=7/2 - 3u. Then shift over stuff to get 5u=9/2.Then divide and get u=9/10

Math homework help !!

lim x-->3x^2 -9 / x^3 - 27 please show steps the answer is suppose to be 2/9-Recall the following identities: x^2 -9 = (x-3)(x+3) x^3 - 27 = (x-3)(x^2 + 3x + 9) So, for x =/= 3 :(x^2 -9)/( x^3 - 27)

Quick trigonometry help

I cant figure out this problem : In right triangle ABC, AB is 4 cm long, BC is 3 cm long, and angle ABC is 90.Find the length of side AC and the size of angle CAB. Thanks!!-This is a 3-4-5 right tr

SIMPLE GEOMETRY QUESTIONS ABOUT LINES

Heres the question: Find DF if D is between E, and F, ED= 6x-4, DF = 3x+5 and EF = 46. There is no picture but its multiple choice. My choices are: 22, 26, 28, or 20. I figured out that: E is the f

A Physics Multiple Choice Q

In mathematical statements regarding vector quantities we may encounter expressions involving the negative of a vector (that is, minus that vector, or multiplied by a -1 factor). What is the visual or

Vectors: system of equations

Plane 1: 3(x-1) + 2y + (z+1) = 0 Plane 2:(x-1) + 4y -(z+1) = 0 The book asks to find the line that is the intersections of the two planes. I saw online how they did it by using the cross product of

How do you work out the angle of depression

If: The Angle of Depression from Ed to the ship is 34 degrees. And the height of the cliff is 30m above sea level. How far out to sea is the ship?-The Angle of Depression from Ed to the ship will equa

Math logarithm problem!!

Show that the equation log2(x + 5) = 5 − log2 x can be written as a quadratic equation in x. Help please! can you please give the steps too?-log₂(x+5)=5−log₂(x) x>0 x+5>0 hence x∈(0,+∞) log₂(x+5)=5

EASY QUESTION ABOUT GEOMETRY! POINTS ON A GRAPH

Heres the question: Find PQ for P (2,7) and Q (-4,2). Round to the nearest tenth. Its multiple choice so: 6, 5.4 , 7.8, -7.8 Im confused I dont even know how to do this?? Thanks! Explain it to if

Maths - can any one tell me how to do graph

i am in 8th and i dont know how to do graph ! our teacher doesnt explain well ! she just make us do the problems or makes us by heart da formulas ! so i exactly dont know how to do it ! can u guys hel

Find all the singular points

Find all the singular points of g(z) = 1/(z^3+i)-You need to find the values for z where the denominator is equal to zero.In other words, z^3 + i = 0... which means z^3 = -i = e^(3πi/2) the cube roo

Trigonometry in Calculus question

Prove that sin(2A) = 2tan(A) / 1 + tan^2(A)-Sin (a+b)=SinaCosb+CosaSinb So Sin(2A)= 2SinACosA = 2sinA/cosA *Cos^A = 2tanA * cos^A = 2 tanA * (cos^A/1) = 2tanA* [cos^A / (cos^A + sin^A)] =2tanA/ [(cos^

What is an example of contradiction, a conditional equation, and a identity

Im doing pre calc in College and I dont know if I learned what ^ that is or if I just forgot, could someone please explain that to me please? Thanks.-contradiction AN EQUATION THAT HAS NO ANSWERS (NUL

Metric conversion stair chart thing

When I was in sixth grade I remember my math teacher drawing a stair and putting on it kg, g, mg etc in order from biggest to smaller and then g would be in the middle I think and you would multiply o