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October 25, 2014

Posts by SARA


Total # Posts: 3,749

Career planning
When considering a post-secondary option, you should consult which of the following sources?
December 6, 2011

statistics
A life insurance salesman sells on the average 3 life insurance policies per week. What type of this distribution is? (2 marks) Let in a given week, calculate probability of the salesman will sell, i. at least one policy. (2 marks) ii. from two to four policies. (3 marks) iii...
December 6, 2011

biology
its B
December 5, 2011

chemistry
How many moles of NH3 are produced from 48.5 g of H2?
December 5, 2011

chemistry
How many grams of N2 are needed to react with 125g of H2?
December 5, 2011

chemistry
How many grams of NH3 can be made from 375g of N2?
December 5, 2011

statistics
A study was made of 413 children who were hospitalized as a result of motor vehicle crashes. Among 290 children who were not using seat belts, 50 were injured severely. Among children using seat belts, 16 were injured severely (based on data from “Morbidity Among ...
December 3, 2011

physics
A stone tumbles into a mineshaft and strikes bottom after falling for 4.2 seconds. How deep is the mineshaft?
November 29, 2011

physics
A water balloon was dropped from a high window and struck its target 1.1 seconds later. If the balloon left the person’s hand at –5 meters/sec, what was its velocity on impact?
November 29, 2011

chemistry
what must be done with the radioactive waste materials that result from splitting atoms and how is this a problem?
November 14, 2011

Astronomy
The distance between the Earth and Mars when the two panets are at opposition varies greatly because of the large eccentricity of Mar's orbit. The perihelion distance of a planet is given by rmin=a(1-e)and the aphelion distance by rmax=a(1+e) where a is the semimajor axis ...
November 14, 2011

biology
another way to afect the enzyme is lowering the pH of the solution. However, lactase is supposed to be able to work in the stomack. Would lowering the pH of the enzyme solution affect the enzyme? Why or why not?
November 11, 2011

Western Civ
Help! Describe the evolutionary account of the emergence of Israelite religion paying particular attention to the ideas of covenant, law, prophets, morality, relations with Canaanite culture, and other themes you deem significant. Also explain how Jewish scripture was put ...
November 9, 2011

6th grade ELA
nnnnnnnoooooooooooooo
November 8, 2011

writing
Mother sewed fur jackets for Father and me
November 8, 2011

writing
how do you do that? that's what I dont get?
November 8, 2011

writing
is this a correct way to write this sentence Mother sewn fur jackets for Father and I, just in case the weather gets bad. thank you!
November 8, 2011

writing
its an exploration narrative journal im writing about seeing the grand canyon for the first time
November 8, 2011

writing
is there another way to rephrase this sentence in a good way. --- All I ever heard about this Grand Canyon thing was that it is piled up with humongous rocks and composed of fossils. thank you!
November 8, 2011

Calculus
Thanks Steve.
November 7, 2011

Calculus
Please help me with the following 2 questions. 1. Find the area of the curved surface of a right-circular cone of radius 6 and height 4 by rotating the straight line segment from (0,0) to (6,4) about the y-axis. 2. Use the Maclaurin polynomial of degree 4 to approximate sin(0....
November 7, 2011

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
November 4, 2011

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?
November 3, 2011

Math
8,9,11,14 , , ,
November 2, 2011

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?
October 30, 2011

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 ...
October 28, 2011

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 ...
October 28, 2011

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!
October 26, 2011

Science
D
October 26, 2011

world history
3 contributions of fancois rabelais
October 23, 2011

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
October 23, 2011

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
October 23, 2011

geometry
what is the perimeter of triangleABC if the coordinattes of A,B and C are (3,7), (7,3) and (-2,5) respectively
October 23, 2011

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 ...
October 19, 2011

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).
October 18, 2011

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?
October 17, 2011

philosophy
how did existentialism fail?
October 13, 2011

Chemistry
completely dissolved-KNO3, NaNO3, Pb(NO3)2 partially dissolved-KCl, KClO3, K2Cr2O3
October 11, 2011

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!
October 10, 2011

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!
October 8, 2011

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
October 7, 2011

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?
October 6, 2011

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 ...
October 5, 2011

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
October 5, 2011

science
what is a machine?
October 4, 2011

us history
thanks!
October 3, 2011

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..?
October 3, 2011

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?
October 3, 2011

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 ...
October 1, 2011

math
Hi
September 30, 2011

Math
Yes, it is the inverse hyperbolic sin.
September 29, 2011

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
September 29, 2011

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
September 29, 2011

help plesse :)
the answer is B
September 29, 2011

math
What is 6% sales tax on $2.59
September 29, 2011

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 ...
September 29, 2011

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!
September 25, 2011

Chemistry
Thank you Doctor Bob this helped a lot i got the answer so i must have done something right :)
September 25, 2011

Chemistry
NO2 + NO = N2O3 Inital concentration 2.0, 2.0, 0 Change concentration , ,2.5 Equilibrium concent. , ,2.5
September 25, 2011

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...
September 25, 2011

algebra
how do you substitute these system of equations 1.y=-3x-3 y=3x-3 2.y=4x-6 y=x thank you!
September 23, 2011

Language
b) Sketch d) crutch f) stretch That all i could get
September 22, 2011

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 ...
September 22, 2011

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 ...
September 22, 2011

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!
September 20, 2011

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!
September 20, 2011

physics
72
September 19, 2011

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!
September 19, 2011

Math
PS sin is raised to the power of 3, so it's sin^3 x.
September 19, 2011

Math
If f (x) = sin3 x, find f'(x). Find f'(−2pi/3) Thanks.
September 19, 2011

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
September 19, 2011

US history
what do you think are the top major events between 1850-1877? thanks
September 18, 2011

math riddles
Trying to find a porking place
September 17, 2011

math riddles for 7th grade
Trying to find a porking place
September 13, 2011

science
sugar is one of the main sources of what for cells
September 10, 2011

science
sugar is one of the main sources of what for cells
September 10, 2011

english
I am having a hard time coming up with a theme for the book "Once upon a town" can someone help me?
September 9, 2011

calculus
When you have a function that changes direction several times, how do you determine the interval over which the function is decreasing?
September 7, 2011

math
sorry typed that rong its supposed to be 2 cubed
September 7, 2011

math
the derections are: Add parenteses so that each equation is correct. 2squared+6-5*4=12
September 7, 2011

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 ...
September 7, 2011

trig
log(x-15)-2=-logx
September 6, 2011

trig
Okay, thanks :)
September 6, 2011

trig
But the question above is loga+logb=loga*b
September 6, 2011

trig
log4+log(x-7)=2
September 6, 2011

math
0.013 x 10^3
September 6, 2011

chemistry
Determine how much heat is evolved or absorbed when 40.0 g of lithium iodide completely dissolves in water.
September 5, 2011

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...
September 3, 2011

Geometry
Find the perimeter of a triangle where the area equals 27 and the height is 3 times the length?
August 31, 2011

u.s history
thanks!
August 29, 2011

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 ...
August 29, 2011

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!
August 29, 2011

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 ...
August 29, 2011

explain the difference between muslims and arabs
Muslim is a religion, wheras arab is like a nationality.
August 28, 2011

Precalc
ohhhh wooow why didnt i think of it that way haha thanks!
August 21, 2011

Precalc
why wouldnt it be cos(theta-20)/2?
August 21, 2011

Precalc
Then how would i bring the r out?
August 21, 2011

Precalc
How would you simplify this polar equation to r=? 2=rcos(theta-20) Would i divide the 2 by both sides?
August 21, 2011

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
August 21, 2011

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
August 21, 2011

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