Can someone please help me out here? I've tried several times and i keep getting the wrong answer :( lol A small crucible is filled with 100.00 mL of n-hexadecane (MW (226.44 g/mol), density (0.7703 g/mL)) and 2.10 L of

172,951 results

Chemistry

Can someone please help me out here? I've tried several times and i keep getting the wrong answer :( lol A small crucible is filled with 100.00 mL of n-hexadecane (MW (226.44 g/mol), density (0.7703 g/mL)) and 2.10 L of 7-octenyltrichlorosilane (MW (245.65 g/mol), density (1....

Geometry

M is the midpoint of LM LM=3x+5 LN=5x+40 Find MN I've tried to work this out several times and am pretty sure I start it off by 3x+5=5(x)+40 but I keep getting a negative answer or a fraction for X and know that is not right. Can someone please help me?

math

How do you solve this? 5x- [1.5 -3.6] [0.2 1.3] [-0.3 2.8]= [-5.6 1.7] 5x/5[-1.5 -3.6] [0.2 1.3] [0.3 -2.8]=[-5.6 1.7] x = [-1.5 3.6] [0.2 1.3] [0.3 -2.8]=[-5.6 1.7] [-1.5 + 0.2 + 3.6 + 1.3] [0.3 + -5.6 + -2.8 + 1.7] x = [-1.3 4.9] [-5.3 -1.1] I have tried to work this out ...

Chemistry

"Suppose some sort of clamp is applied to hold an electron fixed at the distance of 2.5 Angstroms from a lithium nucleus Li3+ which is also clamped into position. Calculate the magnitude of the force between the two fixed particles." The books says the answer is: -2.304 x 10^-...

PHYSICS PLEASE HELP ASAP

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried so many times i keep ...

Math

Hi, I am getting very frustrated. I am doing an online homework for chemistry and it's telling me to round to the nearest WHOLE number. So the answer I got was -1435.650.... And I typed in -1436. and said I was wrong and so I tried it again and typed 1.4 x 10^3, wrong again. ...

PHYSICS PLEASE SOMEONE HELP ME OUT

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried so many times i keep ...

Chemistry

"Suppose some sort of clamp is applied to hold an electron fixed at the distance of 2.5 Angstroms from a lithium nucleus Li3+ which is also clamped into position. Calculate the magnitude of the force between the two fixed particles." The books says the answer is: -2.304 x 10^-...

Derivatives

If g(x) = tan (5x2), then g ′(x) = ? I've worked this problem out like four times already and I keep getting a complete different answer..So I think I'm doing it wrong. I keep getting these.. g'(x)= cosx^2 5tan g'(x)= 2cosxtan^2

Physics Please COULD SOMEONE HELP ME ASAP PLZ

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried so many times i keep ...

algebra 1

-2/3z=-4/9 i tried to solve, but i keep on getting the wrong answer, and i do not understand what i am doing wrong. please help.

chem

Calculate the solubility of magnesium hydroxide (Mg(OH)2), ksp=1.1x10^-11? i have done this problem so many times and keep getting it wrong, i know the answer is 1.4x10^-4 but how do i get there? i did an ice chart and tried doing the cube root but its wrong. help!

PHYSICS PLEASE HELP ASAP

When an object is placed 55.0cm from a certain converging lens, it forms a real image. When the object is moved to 45.0cm from the lens, the image moves 6.00 cm farther from the lens. Find the focal length of this lens? Please someone help me out I tried so many times i keep ...

PLEASE HELP ME! PLEASE!

1 )3x + 8y = 1 7x + 4y = 17 Answer: (3,1) 2) -3x + 5y = -7 9x + 2y = 38 Answer: (4,1) 3) 7r + 3s = 13 14r - 15s = -16 Answer: (1,2) 4) 2x - 7y = 42 4x - 14y = 64 Answer: No Solution ?? 5) 9x + 12y = 15 3x + 4y = 5 Answer: Identity ?? 6) 2 = 4s - 3t 2 = 12s - 9t Answer: No ...

Maths

3x - 6 = 3x/4 With my working out I got x = 24/15 The answers say that x = 8/3 I've tried it several times and got the same answer. IDK whether im right or wrong, please help!! thanks

Physics

Two hockey players traveling at 12 m/s (Player #1) and 19 m/s (Player #2) hit in a head-on collision. They grab onto each other to keep from falling and slide in the same direction Player #2 was traveling at a speed of 5 m/s. Player #1 has a mass of 100 kg. What is Player #2...

Calculus: Area

Can someone look at my work and see what i did wrong. I did this 100 times but i keep getting it wrong Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=3x^(1/2) , y=4 and 2y+1x=4 y=3(x^(1/2...

Find the value of K (Polynomial)

Dtermine the value of K such that -2 is cone root of the equation 2x^3+(K+1)x^2=4-x^2 I tried it a couple of times and I keep getting the wrong answer. The answer is K=3.

Math

(7.66 • 10^2)(6.29 • 10^-4) answer then convert to scientific notation. the answer I keep getting is 0.481814 the scientific notation I get from this is 4.81814*10^5 but i keep getting it wrong. Can someone please help me.

math,correction please..

(x)/(x-2) - (x+1)/(x) = (8)/(x^2-2x) I keep getting x = 6 can someone show me how you guys are getting x = -10 The lowest commond denominator is x(x-2) x/x *(x)/(x-2) - (x+1)/(x) *(x-2)/(x-2)=(8)/x(x-2) multiplying both sides by the common denominator.. x^2 -(x^2-1x -2)=8 x+2=...

PHYSICS

Could u help with physics hw! i keep trying but i keep getting the wrong answer? a 71g autographed baseball slides off of a 1.3 m high table and strikes the floor a horizontal distance of .83m away from the table. 1.how fast was it rolling on the table before it fell off? ok ...

Physics

A concave mirror is constructed so that a man at a distance of 19 cm from the mirror sees his image magnified 2.0 times. What is the radius of the curvature? OK so I have tried to work this out and can't seem to find the answer. Here is what I got. Please let me know if you ...

algebra2

Write the expression (2x)(4y) + 9x + 10y + (8x)(4y) in a simpler form, if possible. I've tried this problem several times, and have gotten the wrong answer. Someone help?

Chemistry

Calculate the molarity of a solution prepared by dissolving 16 g of urea, NH2CONH2, in 39 g of H2O. The density of the solution is 1.3 g/mL. I've tried this question so many times but I keep getting it wrong please help me

Physics

An electron passes location <0.02m, 0.04m,−0.06m>, and 4 μs later is de- tected at location <0.02 m, 1.84 m,−0.86 m>. Find the average velocity of the elecron: ¯v = <vx, vy, vz> If the electron continues to travel at this av- erage velocity...

Math - Algebra 2

I have tried several times to solve this. I have 3 points (0,-5), (3, -6), (-3,-7). I'm trying to get the quadratic equation. I keep getting y=(-1/6)x^2+ (1/6)x +0. When i plug in other numbers to check it's not the parabola facing down like my image. Please help!

Chemistry

H(f) Cl= 121.3 kj H(f) C= 716.7 H(f) CCl4= -95.7 calculate the average molar bond enthalpy of the carbon-chlorine bond in a CCl4 molecule. I have tried to figure it out and keep getting the wrong answer. Please help!

Algebra 2.

16x^4+8x^3+17x^2+8x+1 I have tried it but i keep getting the wrong roots can someone solve this?

Math

Can someone please help me with this question? I have tried to figure it out and I keep getting stumped. Use counters to model and find the product of 2(5). Thanks.

Physics - Mechanics and Ocsillatory Motion

The force shown in the figure acts on a 1.7-kg object whose initial speed is 0.44 m/s and initial position is x = 0.27 m. the figure can be found at: [[webassign dot net forwardslash walker forwardslash 07-16 dot gif]] (a) Find the speed of the object when it is at the ...

Math Domains

I need help with finding out the domain of f(x)= sqrt(x(x-2)). I keep getting the wrong answer. Please help me out and explain.

Math SOMEONE PLEASE PLEASE PLEASE PLEASE HELP

Find sin(θ), cos(θ), tan(θ). Assume a = 40, b = 9, and c = 41. (Do not use mixed numbers in your answers.) Okay for some reason I keep getting this problem wrong. For sin(θ) I put 9/41, but it's wrong. Could someone please tell what I did wrong.

8th Grade Algebra- Answer Check

Solve each system of equations, give the solution and state whether there are no solutions or many solutions. 1 )3x + 8y = 1 7x + 4y = 17 Answer: (3,1) 2) -3x + 5y = -7 9x + 2y = 38 Answer: (4,1) 3) 7r + 3s = 13 14r - 15s = -16 Answer: (1,2) 4) 2x - 7y = 42 4x - 14y = 64 ...

ALGBRA

Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...

Math

Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...

Algebra 1

I had a quiz in math. The problem is: |4.3+(-7.2)| I got the answer 11.5 and my teachr marked it wrong. When she gave us a chance to fix the errors for half credit, I tried it again. But I KEEP getting the same answer. What am I doing wrong?

Math

I need help figuring this out, I tried to simplify 3 times this are fractions, I can't express fractions in here.. -4/7x=12/35 (-7/4) x (-4/7) = -7/4 x 12/35 1 times x = 84/140 I am having trouble simplifying I got so far 42/70, 21/35 and are wrong please help

Chemistry

I keep getting the wrong answer? I know there is one similar to this on here but I keep getting the wrong answer. The gold foil Rutherford used in his scattering experiment had a thickness of approximately 6×10^−3mm. If a single gold atom has a diameter of 2.9×10^&#...

calculus

Evaluate the integral by interpreting it in terms of areas. int_(0)^(9) (7/2x - 21)dx can someone please help me with this question i keep on getting the wrong answer...the answer i got was -324/4

chemistry

A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1 MHz =10^6 Hz}. Calculate the broadcast wavelength of the radio station 98.70 FM. can someone please explain this question for me, i tried several times and all 3 of my...

Math PLEASE help

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...

Algebra

I am stuck in exponential growth and decay. Here is an example. Can someone tell me how to do this step-by-step please? Here it is... The population of Mexico has been increasing at an annual rate of 1.7%. If the population of Mexico was 100,350,000 in the year 2000, predict ...

calculus

The region between the graphs of y=x^2 and y=2x is rotated around the line x=2. The volume of the resulting solid is ____. Please help. I've tried this problem so many times but i keep getting it wrong. I thought the outer radius would be (2-0) and inner radius is (2-x^2) ...

physics

i tried doing this on my calculator but i keep getting the wrong answer..can someone try it on theirs and tell me what they got? thanks Substitute the period in seconds, T = 86,400 s, the gravity constant G = 6.67 multiplied by 10-11 kg-1 m3/s2, and the mass of the Earth, ME...

chemistry

calculate the grams of 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl I tried 1.8 times 8.00g divided by 58.44g times 100 my answer is 24.6g rounded to 2 SF is 25g this truned out to be wrong I'm stumped!

calculus

For x>0 find and simplify the derivative of f(x)= arctan(x) + arctan(1/x). I've done the problem a few times and I keep getting (1)/(1+(x)^2)+(1)/(1+(1/(1/x)^2))(-x)^-2 but something about the answer is wrong and I cannot figure out what.

Math

Atmospheric pressure changes as you rise above earth's surface. At an altitude of h kilometers, where 0<h<80, the pressure P is newtons per square centimeter is approximately modeled by the function P(h)=10.31e^(-0.116h). What is the approximate pressure at 50 kilometers...

Algebra 2

I need help with this problem, (3-x)/-4 = (x+6)/3 Thanks! I've tried it myself several times and I keep getting stuck. multiply both sides of the equation by -12 Yields 9-3x=-4x-24 add 4x to each side, subtract 9 from each side. I don't really see how that works.

Algebra

Solving quadriatic equaitons using factoring. X^2-6=30-3x^2 The answer in the book is -3,3. I have tried to work the problem several times. I am not getting this answer.

calculus

I've tried this problem about 20 times and a bunch of different ways and I can't seem to get it right. The problem is: Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. Where y=1/(x^3), y=0, x=4, and x=8. I know ...

Calculus

Compute (f^-1) (2) if f(x) = 7x + 3cos(x) + 2sin(x).... We tried solving it in the form (f^-1)(a) = (1/f'(f^-1(a))... or is this a u-sub problem? We are trying to figure out whose way is right with one getting the answer as 1/2 and the other 1/10... we are getting mixed up ...

math

can someone actually show me all the steps to finding this deriviative. I keep doing the problem out and getting the wrong answer. Find the deriviative of: INVERSEsin(2t)^1/2

chemistry

A sample of 690. moles of O2 reacted according to the balanced equation, 4Al+3O2=2Al2O3 after reaction, 163 moles of O2 remained. calculate the moles of Al2O3 formed. Ive tried this problem many times and i keep getting it wrong. please help! thanks

Algebra

- ok... we keep getting this one wrong: Solve the following equation for x. Write your answer as a fraction in simplest form. -6(x-5)=-2x-8-6(3x-5) What is it you don't understand about this? Clear the parentheses, combine terms, solve for x. Ive been doing that but i keep ...

Math

Can i get some help on -2/5 x -1 1/4 please tried doing this multiple times but i keep getting weird answers that don't match up at all.

Physics

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s? I keep getting the answer 34.3m/s but it is counted wrong. I found an answer on Chegg that say 29.4 m/s but I can't figure out how they are getting that answer.

math

For y(x)=ln(3+x2), find y`(6) I keep getting 12 but it says that its the wrong answer, really stuck here

D/dt

Calculate d/dt when a=t^2, b=2 and sqrt(x+1)dx. My answer turns out to be incorrect despite my checking it several times. I got -2/3t* sqrt(t^2+1) Can someone explain to me what is wrong with my answer and how to go about obtaining it the right way? Thank you everyone. :-)

Calculus

Please help!! I keep solving this problem but I keep getting the wrong answer. Find the derivative of the function: f(x)= xsqrt(x-1)/(x+2)

MATH

Good Evening Ms SUE, Frankly I tried the below some as you said but still I am not getting the answer still i am getting the same answer as option A. 2 1/6 n I know this is wrong Mam if you don't mind can you check n tell where i am wrong and correct me please. Thank You It ...

Calculus

Using l'hopitals rule, evaluate the following: Lim x-->infinity Inx/2(x)^1/2 Limx-->0 (1/x - 1/e^x -1) I tried both multiple times and I'm still not getting an answer. For the first one I tried l'hopitals rule 3 times and I'm still getting infinity over infinity for an ...

Math

how do you solve this I keep trying and I keep getting the wrong answer. I keep getting x=19000 and that is not correct .10=.9(x/15000)+.14[(1-x)/15000]

Math

A conical water tank with vertex down has a radius of 10 feet at the top and is 22 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 14 feet deep? I have tried several times but keep ...

Math

Hi I wanted some help with this question, I don't want the answer though as I want to try to see where my workings are going wrong. 3 x 34 / 9 - 2 (10 - 6) - 4 / 2 A -13 B 5 C 6 D -14 But I'm getting -3. Here's how I work through the equation using PEMDAS as a guide to order: ...

math 30

I need to write 4x^2 - y^2 -8x -4y + 16 = 0 in standard form and I keep getting it wrong. Could someone please help me. Thanks

6th Grade Probability

The probability of winning a game is 25%. How many times should you expect to win if you play 36 times? A. 3 times B. 7 times C. 9 times (I think it's the answer) D. 11 times Please help me! If I'm wrong can someone please explain to me why and the correct steps and answer. ...

Chemistry

I have tried to solve this problem, but I keep getting it wrong. Please advise on this question.My answer will be listed under the problem. An ore contains 2.79 g of silver per ton of ore. What is the concentration of silver in ppm? My Answer: 0014164.8

Math

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...

calculus

please help! Find an equation of the tangent line to the curve at the point (-1, 1). y = 5x3 - 6x. y=? ...............i keep getting y=x+2 and its wrong. can someone please help?

math. PLEASE HELP.

Question: If A= 29 degrees and a= 4.6, find c. There is a diagram shown in the textbook. b is adjacent, c is the hypotenuse, and a is opposite. I know I'm suppose to use SOH CAH TOA, and i tried using tan, but Im not getting the correct answer. i looked in the back of the ...

chemistry

A student weighs out a 14.4 g sample of copper(II) bromide, transfers it to a 500 mL volumetric flask, adds enough water to dissolve it and then adds water to the 500 mL tic mark. What is the molarity of CuBr2 in the resulting solution The answer I keep getting is completely ...

Calculus

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=3sqrt(x), y=5, and 2y+3x=6 I tried this many times and i am getting it wrong. Please show me how you got to the answer.

Math-- Fractions-- I Desperately Need Help!!

I need help with this problem. Estimate 16 20/21 times 28 3/7 minus 4 13/25 plus 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 (Possible answers) One is the correct answer. A. 452 B. 480 C. 488 D. 492 1/2 I have tried to work this and keep ...

Pre Calculus

So I only have 3 homework questions left and I can't seem to figure out how to solve. I've tried solving them, but I keep getting them wrong. Any help? Factor the polynomials: a) 3x^2 +19x - 40 b) x^4 - 25x^2 Simplify the expression completely: (1/(x-h)^3 - 1/x^3)/8h

physics

Consider a roller coaster as it travels near the bottom of its track as sketched in the figure below. At this point, the normal force on the roller coaster is three times its weight. If the speed of the roller coaster is 27 m/s, what is the radius of curvature of the track? I ...

Pre-Cal

If g(x) = tan (5x2), then g ′(x) = ? I've worked this problem out like four times already and I keep getting a complete different answer..So I think I'm doing it wrong. These are the answers I have gotten while doing this problem. g'(x)= cosx^2 5tan g'(x)= 2cosxtan^2

Calculus

Let f be defined as follows. y = f(x) = x^2 - 4 x (a) Find the average rate of change of y with respect to x in the following intervals. from x = 5 to x = 5.5 For some reason I keep getting this wrong. The way I did it was: f((5.5)-f(5))/(x2-x1)= 22-5/5.5-5=34 This is wrong, ...

Linear Equations

Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve the systems of equations by the substitution ...

Chem

Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 67.1 g of CS2 yields 45.2 g of CCl4, what is the percent yield? (Hint, you must first write the balanced equation.) 67.36 I tried this a couple ...

PreCalc

6t + 5(t-1)/3 =4 Please help, I keep getting the wrong answer.

Math/Conversions

Good afternoon, could someone please help me with this? The answer is 22 1/2 oz. Doctor instructs pt to drink 1 L (33 4/5oz) of water. An hour later you find 1/3 L left. How many ounces did Ms. White consume? This is what I keep getting. I think I may be doing the wrong ...

Calculus

I've been working on this problem for while, and I keep getting the answer wrong every time I do it. The volume of the solid obtained by rotating the region enclosed by y=e^(5x+1) y=0 x=0 x=0.8 about the x-axis can be computed using the method of disks or washers via an ...

Composite Materials

Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and small piece of composite...

Algebra 1

Which expression is the factored equivalent of 3x^2-4x+1? A. (3x-1)(x-1) B. (3x-1)(x+1) C. (3x+1)(x-1) D. (3x+1)(x+1) When I factor it, I keep getting D. But I know the answer is A. So this must be a common mistake students make. What am I doing wrong? Here is my work. 3x^2-4x...

Chemistry

The heat of fusion of water is 6.01 kJ/mol. The heat capacity of liquid water is 75.3 J/mol • K. The conversion of 50.0 g of ice at 0.00°C to liquid water at 22.0°C requires how much kJ of heat? Can someone explain how to do this, I tried but keep getting the wrong answer.

calculus

use Simpson's with n=10 to approx. f(x)= x sin x, 0¡Ü x ¡Ü2¦Ð round to 6 decimal places I know I set up the calculation correctly like this: (pi/15)(f(0)+4f(pi/5)+2f(2pi/5)+...+2f(8pi/5)+4f(9pi/5)+f(2pi) I keep getting a negative answer but I know that the answer is ...

Algebra

Find an equation of the line having the given slope and containing the given point. M=4/5, (7,-8) I can totally due the equation y+8=4/5x-28/5 but keep getting the answer wrong. I cannot figure out how subtracting 8 they get the answer y=4/5x-68/5 PLEASE HELP!

Physics

In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.41 × 106 m/s. Find the central force acting on the electron as it revolves in a circular orbit of radius 4.92 × 10−11 m. Answer in units of N. i used 9.10938188 × 10-31 as my mas and ...

Math

How to divide 150 by 3.6 please tell me with steps I tried it several times but can't seem to figure it out!!!

math

Remove the parenthises and simplify: 8p+3q-9(8p-5q+9r) I have gotten lost on this one. Anyone have any ideas? I tried combinging like terms, but I keep getting the wrong answer.

Antiderivatives

For the function f, given below, find the antiderivative F that satisfies F(1)=1. f(x)= x^5 -4x^-3 -4 . I keep getting x^6/6 +x^2 -4x + 17/6 . But my answer is wrong My other answer of x^6/6 +4x^-2 +4x + 43/6 is wrong also. They both end up equaling 1. So what am I doing wrong?

complaint

I would like to complain about the service we're getting here. I'm sure you guys work very hard, but the last few times I have posted a question on your forum I didn't get an answer until days later (not even from a Jiskha volunteer, a student), long after the homework was due...

Math

Use absolute value to determine the distance between the two numbers. -3.5 and 4 1/4 |-3.5- 1 1/4| |-3.5- 9/4| |-3.5/1 - 9/4| |-14/4 - 9/4| |-23/4| 23/4 5.75 I got 5.75 as my answer. But why does my answer key show 7.75 units? I'm not sure what I did wrong. I've double checked...

mat/116

Will someone please help me slove this problem? Use the elimination method to solve the system of equations. 5u+2v=-18 3u+v=-5 I have tried to solve this problem several times and have not gotten the correct answer please help. Thank you.

statistics

Help!!I have tried this several times and come up with wrong answer. WHAT PERCENTAGE OF A NORMAL DISTIBUTION IS GREATER THAN THE MEAN? (GIVE ANSWER TO NEAREST PERCENT)THIS ONE I GOT 68% AND IT WRONG... AND WHAT PERCENTAGE IS GREATER THAN A VALUE THAT IS 1 STANDARD DEVIATION ...

algebra

I don't know proceedure to figure, I have answer: -50 I cannot figue out steps to get correct answer. I keep getting 0. -52 - (-5)2 P.S. both twos are small and raised. Cannot get it exact on this message board

math

((0.1095)(25) - (0.1482)(29.04)) / ((1000)(1.3010)) i keep getting -.0012 but it is wrong what do you guys get I haven't figured it out yet it is -.0012. i am one hundred percent sure. maybe the answer key is wrong.

Pre-Algebra

Can I have someone check this please? I wouldn't want to do the whole page, then find out I had done them all wrong. :( [Percents of Change] A $100 digital watch is now $72 Decrease, 72/100 = negative percent. 100/72.00 = .72 .72 - 1 = 30%? Thanks. 30% is my final answer, ...

physics

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 10 % of its mass in 340 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 170.0 s? (suppose that the ...

Math

Hi, I tried this problem different ways, but keep getting it wrong.I am rusty, and need a demonstration of how to do it, thanks! 2x+6.7x-6

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