Monday
April 21, 2014

Posts by SARA


Total # Posts: 3,531

math- precalculus
Help please! I can't seem to get x as the answer to prove that they are inverses of each other! Show what f and g are inverse functions algebraically f(x)= x-1/x+5 g(x)= -5x+1/x-1

Algebra 1
What is the answer to 10-3x is less than or equal to 7x? I tried the problem, but I keep getting x is less than or equal to 1. Is that right?

Statistics
Suppose that a sample of 50 scores has a mean of Y=90 and the standard deviation is 15. Between what two values of Y will at least 90% of the scores fall? What is the maximun number of scores that can lie out of the interval?

chem
Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula. What is the pH of the solution created by combining 11.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? Complete the table b...

chemistry
Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula. What is the pH of the solution created by combining 2.00 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? Complete the table bel...

Math algebra
how do you do this by using the FOIL method? 1. 3x^2 + 22x + 7= 2. 2x^2 + 5x - 12= 3. x^2 - 11x + 28= thank you!

world history
3 contributions of fancois rabelais

geometry
line rs intersects line lm at p, angle rpl=x+y, lps=3x+2y, mps=3x-2y. solve for x and y find angle RPL, LPS, and MPS

geometry
line MN is perpendicular to op If the coordinates of M,N and O are (2,4), (-5,-8) , (-6,2) respectively, find the equation for line OP

geometry
what is the perimeter of triangleABC if the coordinattes of A,B and C are (3,7), (7,3) and (-2,5) respectively

Physics
A projectile is fired with an initial speed of 28.0 m/s at an angle of 65 degrees above the horizontal. The object hits the ground 9.5 seconds later. a) How much higher or lower is the launch point relative to the point where the projectile hits the ground? b) To what maximum ...

CALCULUS ONE!
The graph of sinx and cosx intersect once between 0 and pi/2. What is the angle between the two curves at the point where they intersect? (You need to think about how the angle between two curves should be defined).

Chemistry
You have 250 mL of a 0.80 M solution of silver nitrate AgNO3 (169.87 g/mol) dissolved in water. How many grams of AgNO3 does the solution contain?

philosophy
how did existentialism fail?

Chemistry
completely dissolved-KNO3, NaNO3, Pb(NO3)2 partially dissolved-KCl, KClO3, K2Cr2O3

Physics
Let vector A = 4i^ + 4j^, vector B = -2i^ - 5j^, and vector F = vector A - 5(vector B). a) Write vector F in component form. vector F = ? b) What is the magnitude of vector F? F = ? c) What is the direction of vector F? theta = ? Thank you!

Physics
Let vector A = 4i^ + 4j^, vector B = -2i^ - 5j^, and vector F = vector A - 5(vector B). a) Write vector F in component form. vector F = ? b) What is the magnitude of vector F? F = ? c) What is the direction of vector F? theta = ? Thank you!

H.W in Partial economy
Bundle** Oranges/Week ** Total Utility A 0 50 B 1 80 C 2 100 D 3 115 E 4 125 F 5 133 G 6 139 H 7 144 I 8 146 J 9 147 K 10 147 L 11 147 M 12 147 N 20 147 From the above table draw TU curve and MU curve find MU when using the fourth oranges, then derive the demand line

big lake
Two cyclists, 36 miles apart, start riding toward each other at the same time. One cycles 2 times as fast as the other. If they meet 2 hours later, what is the speed (in mi/h) of the faster cyclist?

Physics
Tim and Rick both can run at speed Vr and walk at speed , Vw with Vr > vw. They set off together on a journey of distance . Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half. How long does it take Tim to cover the di...

grammar
need to know some examples for the nominative comparative and superlative of irregular words apart from good better best , bad worse worst and little less least

science
what is a machine?

us history
thanks!

us history
Im doing a crossword and im stuck on the last one. the topic is immigration and urbanization. 1. neighborhoods on the outskirts of a city..?

government
hey i need help in this question Is there ever a time where american citizens disagreed with the way the government is handling things in the past?

math
Allyson and Adrian have decided to connect their ankles with a bungee cord; one end is tied to each person's ankle. The cord is 30 feet long, but can stretch up to 90 feet. They both start from the same location. Allyson moves 10 ft/sec and Adrian moves 8 ft/sec in the dir...

math
Hi this is gay

math
Hi

Math
Yes, it is the inverse hyperbolic sin.

Math
Let f(x)=sinh^−1(6x). Then f(x) can be written in the simplified form (Ax+B)/(sqrt(Cx^2+D). What are the values of A,B,C and D? Again, please show me how to do this. Thanks

Math
Let f(x)= (sqrt(25−x^2))+5 arccos (x/5). Then f(x) can be written in the simplified form − [(x+c)/mx+n)]^p. What are the values of c,m,n and p? Please tell me how to do this question. Thanks

help plesse :)
the answer is B

math
What is 6% sales tax on $2.59

math
A class of 25 students has 10 boys. Three boys have braces and 4 girls have braces. a) What is the ratio of boys with braces to boys in class? b) What is the ratio of girls with braces to girls in class? c) Which group has the largest ratio of students with braces to students ...

Calculus 2
The question is: Evaluate the improper integral for a>0. The integral is: the integral from 0 to infinity, of e^(-y/a)dy Can anyone help me solve this? When I try I get 'a', which apparently is incorrect. Thank you!

Chemistry
Thank you Doctor Bob this helped a lot i got the answer so i must have done something right :)

Chemistry
NO2 + NO = N2O3 Inital concentration 2.0, 2.0, 0 Change concentration , ,2.5 Equilibrium concent. , ,2.5

Chemistry
For the reaction NO2(g) + NO(g) = N2O3(g) If at particular temperature, K was 575 and equilibrium concentration of N2O3(g) was 2.5 M, calculate the equilibrium concentrations of NO2(g) and NO(g) if they both had the same initial concentrations. i have my table layed out like.....

algebra
how do you substitute these system of equations 1.y=-3x-3 y=3x-3 2.y=4x-6 y=x thank you!

Language
b) Sketch d) crutch f) stretch That all i could get

Chemistry
I don't understand one of my homework questions i'm really stuck. please help! How will the equilibrium: Heat + CH4(g) + 2H3S(g)= CS2 (g) + 4H2 (g) be affected by the following: a) A decrease in temperature. b) The addition of H2. c) The removal of some CH4 (g) d) An i...

Chemistry
I don't understand one of my homework questions i'm really stuck. please help! How will the equilibrium: Heat + CH4(g) + 2H3S(g)= CS2 (g) + 4H2 (g) be affected by the following: a) A decrease in temperature. b) The addition of H2. c) The removal of some CH4 (g) d) An i...

algebra!
how do you solve this by substitution: step by step 1. 5x-y=16 5x+2y=13 2. 3x-3y=9 2x-4y=-16 3. x=-6y y=2/3x+5 thank you!

Math
how do you solve this by substitution: step by step 1. 5x-y=16 5x+2y=13 2. 3x-3y=9 2x-4y=-16 3. x=-6y y=2/3x+5 thank you!

physics
72

geometry!
can anyone please explain to me how to solve these problem step by step: 1. 3x+y= -6 2. 2x-5y=12 thank you!

Math
PS sin is raised to the power of 3, so it's sin^3 x.

Math
If f (x) = sin3 x, find f'(x). Find f'(−2pi/3) Thanks.

Math
1. Evaluate the indefinite integral integral symbol[6x5+2sec(x) tan(x)]dx. 2. Integral symbol 8 at the top, 5 at the bottom 3x2+3x2 dx = Thanks

US history
what do you think are the top major events between 1850-1877? thanks

math riddles
Trying to find a porking place

math riddles for 7th grade
Trying to find a porking place

science
sugar is one of the main sources of what for cells

science
sugar is one of the main sources of what for cells

english
I am having a hard time coming up with a theme for the book "Once upon a town" can someone help me?

calculus
When you have a function that changes direction several times, how do you determine the interval over which the function is decreasing?

math
sorry typed that rong its supposed to be 2 cubed

math
the derections are: Add parenteses so that each equation is correct. 2squared+6-5*4=12

u.s history
my question kind of has 2 parts. first off i am trying to put in order what i think are the 10 most important things that happened between 1800-1850's does any one have any idea what they might be? also. What presidents where president between the 1800-1850 and what order ...

trig
log(x-15)-2=-logx

trig
Okay, thanks :)

trig
But the question above is loga+logb=loga*b

trig
log4+log(x-7)=2

math
0.013 x 10^3

chemistry
Determine how much heat is evolved or absorbed when 40.0 g of lithium iodide completely dissolves in water.

math
A movie theater seats 500 people. For any particular show, the amount of money the theater makes is a function m(n) of the number of people, n, in attendance. If a ticket costs 2 dollars, find the domain and range of this function. domain: ?≤ n ≤? range: ?≤ m...

Geometry
Find the perimeter of a triangle where the area equals 27 and the height is 3 times the length?

u.s history
thanks!

u.s history
I have a test tomorrow in US history that I am studying for. My teacher told us that on the test we will have to put 10 of the most important and relavent things that happened from prehistory to 1824. I have a hard time learning history. I know the first and last thing she wan...

psychology
Not asking to do my work for me, this is the question. I am cunfused to what therory makes personality? Did ask for attitude asked for help!

psychology
1.Once you have read about the major perspectives in psychology, identify any questions you have about these seven major theories (psychodynamic, behavioral, humanistic, cognitive, Biopsychological, Evolutionary, Sociocultural). You must come up with at least one question rela...

explain the difference between muslims and arabs
Muslim is a religion, wheras arab is like a nationality.

Precalc
ohhhh wooow why didnt i think of it that way haha thanks!

Precalc
why wouldnt it be cos(theta-20)/2?

Precalc
Then how would i bring the r out?

Precalc
How would you simplify this polar equation to r=? 2=rcos(theta-20) Would i divide the 2 by both sides?

Precalc
Identify the graph of the equation. What is the angle of rotation for the equation? y^2+8x=0 is parabola 90 degrees correct? also Identify the graph of the equation. What is the angle of rotation for the equation? xy = -5 =hyperbola 45 degrees

Precalc
Write the equation of the hyperbola whose center is at the origin and has a vertical transverse axis. The equations of the asymptotes are 6x + 2y = 0 and 6x - 2y = 0. Is this correct? (y^2/9)-(x^2/4)=1

Precalc
okay thanks!

Precalc
Write the equation in standard form of the ellipse with foci (8, 0) and (-8, 0) if the minor axis has y-intercepts of 2 and -2. is the answer: x/64+y/4=1

Math
.4 is not the right answer.

chemistry
N204 (l) Delta Hf (kJ/mol) = -20 E cell S (J/mol.K) = 209 N204(g) Delta Hf (kJ/mol) = 10 E cell S (j/mol.k) = 304.1 Given the following data, determine the temperature at which n2o4 (l) and n204 (g) can exist in equilibrium? a. 42 C b. 3 C c. -231 C d. 30 C e. -178 C

math
what is the largest negative coterminal angle of -417?

english
thank you

english
can anybody help me know negative reasons i have allot of positive

english
its not really giving any negative reasons

english
reasons why fables can be a negative thing on children?

Reading
it means I'd rather die than be disgraced or "to die without revealing secrets or betraying trusts"

Accounting
Complete an Income Statement, Statement of Owner's Equity, and Balance Sheet using the information provided below for Rya’s Planning Services. Cash… …… ……… … … … ………$21,500 Accounts Receivable…… ...

Statistics
Solve the following problems by using the binomial formula. a. If n = 4 and p = .10 , find P(x = 3) . b. If n = 7 and p = .80 , find P(x = 4) . c. If n = 10 and p = .60 , find P(x ¡Ý 7) . d. If n = 12 and p = .45 , find P(5 ¡Ü x ¡Ü 7) .

insurance
by signing an "assignment of benefits" statement , a patient is?

chemistry
how ccan i make nh4oh from nh3?

Algebra II
Simplify x^6/2xy^-5

health care
by creating a committe on social welfare, the American Association of Labor Legislation helped to?

Algebra
If the formula R= -0.0371 + 50.1 can be used to predict the world record in the 400 meter dash t years after 1925, for what years will the world record be 48.1 secons or less?

chem, acids
possible products of acetylsalicylic acid when it hydrolyzes are salicylic acids and acetic acids or is it carboxylic acids and alcohol?

chem
Nevermind, i got it

chem
This is for my vinegar titration lab: why are samples of vinegar weighed rather than measured ?

Chem
I'm doing a vinegar titration lab and i need to know how can my acetic acid in vinegar be affected if a few droops of NaOH solution is not washed down with distilled water

chemistry
THANKS!!!!

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