Thursday

October 8, 2015
Number of results: 726

**math**

the probabilities that 3 friends A,B andC pass a driving test are1/3,1/4,2/5 respectively.All 3 take the test find the probability that(a)aa 3 failed the test (b) only B passes the test(c) only 2 of them pass the test (d)at least 1 passes the test... I will do one. Assuming ...
*June 26, 2007 by celina*

**stats**

a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following: a) prob that he will guess all of them right b)prob that he will guess at most 12 right c) prob that he will ...
*February 18, 2011 by gio*

**TRIGONOMETRY**

Write the following trigonometric expression as an algebraic expression in x free of trigonometric or inverse trigonometric functions sin(cos^-1 x) -1≤x≤1
*December 4, 2012 by Matthew*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) d...
*March 23, 2010 by Mark*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan Q = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) ...
*March 23, 2010 by Mark*

**Math**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) d...
*March 23, 2010 by Mark*

**statistics**

Use the normal dist to approx the desired prob. Find the prob of getting at most 30 fives in 200 tosses of a fair 6 sided die
*October 4, 2013 by Sandra*

**Statistics**

How do I plug this into the Binomial Probability Formula? prob(lost) = 5/1000 = 1/200 prob(not lost) = 199/200 prob( 2 of 22 are lost) = C(22,2) (1/200)^2 (199/200)^20 = .005224..
*March 9, 2014 by Brenda*

**Trigonometric prob.**

Hi, my question is attached to the web below (picture), because I can't draw the diagram on here. Sorry for any inconvenience. Please help and thanks. imageshack . us/photo/my-images / 845 / img0043gx . jpg/ Sorry, the web address is spaced out so you need to put it together.....
*April 30, 2012 by Anonymous*

**Math**

How do I work this math prob. I always have a B and would like to bring it up. Caan you PLEASE help me with this prob. on unit rates "$2 for 5 cans of tomato soup"
*January 10, 2011 by Sarah*

**Trigonometric Expressions**

Simplify and write the trigonometric expression in terms of sine and cosine: tanxcscx= 1/f(x) What does f(x)=
*July 20, 2011 by Anonymous*

**math**

State a trigonometric ratio that is equivalent to each of the following trigonometric ratios Sin 3pie/10 Cos 6pie/7
*November 10, 2012 by Melissa*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. Sorry for the mistake. They are two seperate functions and i need...
*March 23, 2010 by Mark*

**math- algebra- help please!**

3 dice are rolled let (y,r,b) represent each outcome? a- sample space b- prob rolling a sum of 18 c- prob of rolling a sum less than 5
*April 6, 2011 by Zach*

**algebra**

Prob.1: -14=2x+2x-2 Prob.2: 5x=50
*May 29, 2013 by cheyenne*

**math 10**

determine the value of the three primary trigonometric ratios i have triangle in front of me but what am i looking for? what is trigonometric ratios?
*February 4, 2010 by just wondering part 2*

**Trig.**

I really need help so please help. write the first trigonometric function in terms of the second trigonometric function. sec x; tan x
*April 30, 2010 by Theresa*

**Trigonometric Identities**

Which of the following are trigonometric identities, I have narrowed it down to two - (cscx + cotx)^2 = 1 OR sin^2(x)sec^2(x) + 1 = cot^2(x)csc^2(x)
*March 24, 2011 by Veronica*

**Trig**

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A
*December 13, 2011 by Carl*

**Statistics**

DIAGRAMS MUST BE DRAWN Given the standard normal distribution, determine:Prob Z greater than 1.50 Prob Z between1.06 and 1.96 Given the standard normal distribution determine the Z values that contain 80% in the middle of the curve.
*March 2, 2013 by Sue*

**Probability and Statistics (Continuation)**

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth trial? MY answers: a) P...
*September 29, 2013 by Katy*

**STATISTICS**

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM ARE CURED? WHAT IS THE PROB. THAT MORE ...
*February 10, 2008 by todd*

**statistics**

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM ARE CURED? WHAT IS THE PROB. THAT MORE ...
*February 10, 2008 by todd*

**statistics**

Pinworm infestation commonly found in kids can be treated with the drug pyrantel pamoate. Research shows the treatment is effective about 90% of cases. The drug is administered to 25 kids. What is the probability that exactly 23 of them are cured? What is the prob. that more ...
*February 10, 2008 by todd*

**Finance**

Assuming that the returns from holding small-company stocks are normally distributed, what is the approximate probability that your money will double in value in a single year? What about triple in value. Many of my classmates have an expected return of 17.6% and a standard ...
*July 15, 2012 by Anonymous*

**ECON! Please help!**

Joe: y= 100 (High) prob = 2/5 =25 (medium) prob= 2/5 =0 (low) prob = 1/5 Calculate: 1. José’s risk premium, p, associated with farming and 2. José’s certainty equivalent associated with farming. The village decides to implement an informal insurance (risk sharing) arrangement...
*June 1, 2010 by anonymous*

**statistics**

Information given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**Stats**

nformation given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**Trigonometric Functions**

Determine the Value of all six trigonometric functions of theta when given? I need help. This is for my midterm review, if anyone is willing to help, I'd appreciate it. a) sin theta= 3/5 and theta is in quadrant 1. b) tan theta= -2 and theta is in quadrant II c) sec theta = 2 ...
*January 6, 2008 by Mike*

**Trigonometry**

I don't understand how I'm supposed set the problem up or what theta is... Use the given function value(s), and trigonometric identities (including the cofunction identities), to find the indicated trigonometric functions. sec theta = 5, tan theta 2 * 6^1/2 a) cos theta b) cot...
*April 23, 2009 by Chris*

**Calculus 2**

Evalute the integral of x/(x^2+4)dx using u-substitution and then trigonometric substitution. I did this and got (1/2)ln(x^2+4)+C using u-substitution and x^2+4+C using trigonometric substitution. What did I do wrong??? thank you for helping!
*October 10, 2012 by Heather*

**math**

dale placed six cARDS IN A BAG.QONE CARD IS LABELD 1,TWO CARDS ARE LABELD2,AND RTHREE CARDS ARE LABELD 3.FIND THE PROBABILITY OOF PICKING TWO CARDS IN THE ORDER OF THE NUBERS LISTED TH EFIRST CARD IS RETURNED BEFORE THE SECOND IS PICKED ..... P,(1,2) P(3,NOT1) p(NOT2,2) P(1,3...
*May 22, 2007 by sam*

**trigonometric identities**

Prove the following trigonometric identities 1. tanx = sinx + sin^2x/cosx(1+sinx) 2. cos^3+(cosx)(sin^2x) = 1/secx
*June 22, 2012 by noel*

**circular (trigonometric) functions**

hi, i need help solving this trigonometric equation: sinx+3cosx=0 i don't know what to do as i can't just diviide the two to create tanx which is what i have been doing in previous questions... yes, you are on the right track sinx = -3cosx sinx/cosx = -3 tanx = -3 so x must be...
*April 14, 2007 by elle*

**Trigonometric Substitution**

Trigonometric Substitution a. Explain why the substitution x = asin(Theta) guarantees that cos(Theta) is greater than or equal to 0 . b. What sort of restriction must we put on x and a so that the substitution x = asec(Theta)will guarantee that tan(Theta) is greater than or ...
*June 28, 2011 by John*

**trig**

find the reference angle of -20000 and express the six trigonometric functions of -20000 in terms of the six trigonometric functions of its reference angle.
*September 15, 2012 by patrick *

**stats again**

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
*July 5, 2007 by holly*

**algebra**

another prob(last one) 6x-7x=18
*June 8, 2010 by Anonymous*

**Prob/Stat**

If P(A) = .3 and P(B) = .4 and P(AandB) = .2 what is P(A/B)? P(B/A)? Are A and B indepentent?
*April 1, 2012 by Sheila*

**quantum**

prob 2 ans please?
*September 13, 2013 by Anonymous*

**math prob**

how many midsegments does a triangle have?
*May 8, 2009 by gabe*

**math**

so the prob of drawn an ace or spade is 4/52
*October 27, 2009 by rency*

**chemistry **

So i if do 4 x250/100 i will get the answer for the prob?
*July 18, 2014 by kody*

**Math Prob**

ok for changing the base of a log from 10 to e is there a formula?
*December 11, 2008 by confused*

**Pre-Calc**

I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin ...
*April 13, 2015 by Alyssa*

**SPELLING PLEASE help**

the prob is: middle : center :: thinner : s _ _ _ _er
*November 27, 2007 by Amber*

**trigonometry**

(a) If è is in standard position, then the reference angle è is the acute angle formed by the terminal side of è and the ---Select--- x-axis y-axis . So the reference angle for è = 120° is è = ?°, and that for è = 210°is è = ? degrees. (b) If è is any angle, the value of a ...
*September 12, 2015 by lovelady7*

**MATH Prob.**

How many different ways can a teacher line up 5 students for lunch?
*August 20, 2009 by Twg*

**stats & prob.**

Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the standard deviation of the data.
*November 27, 2012 by Georgia*

**probability!**

we were given a chart - "researchers developed the following tabel of joint probabilities of number of drinks per day and development of ulcers" and the question is a. what proportion of people have ulcers - how am i supposed to know htis b. what is the prob that someone who ...
*October 21, 2010 by Lauren*

**tRiG/ AlGeBrA**

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4
*February 27, 2012 by CHEYANNE*

**Pre-Calc**

1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one ...
*April 13, 2015 by Alyssa*

**prob.**

If it is given that P(A)=1/3 and P(B/A)=2/3 (the dividing sign is ment to be a vertical bar), what is P(A and B). I got .07. Is this correct? If it isn't, why not?
*December 18, 2008 by Juliette*

**MATH Prob.**

How many three-symbol codes can be formed from the letters I, S, P, and Y without repetition?
*August 6, 2009 by Twg*

**trig**

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4
*May 28, 2012 by marie*

**MATH Prob.**

Three angles of a quadrilateral each measures 87*(degrees)..what is the measure of the fourth angle??
*August 19, 2009 by Twg*

**MATH Prob.**

What is the expected value of one 700 tickets in a raffle for a prize of $1400?
*August 20, 2009 by Twg*

**trigonometric**

2 cos x - 1 =0
*May 5, 2010 by charles*

**MATH Prob.**

how many three letter symbols can be formed from the letters A,C,K,L, & M without repetition? so far I have 12
*August 8, 2009 by Twg*

**Algebra 2: Prob and Stats**

Find the sample size that produces the margin of error +-4.0% a) 325 b) 25 c) 16 d) 625
*May 24, 2010 by Skye*

**Trigonometry**

what is the trigonometric form of z=1+i?
*December 1, 2012 by Josh G.*

**MATH Prob.**

if you have two fair dice that are rolled, what is the probability of a sum 6 given that the roll is a 'double'?
*August 8, 2009 by Twg*

**MATH Prob.**

What are the odds in favor of getting at least one head in three successive flips of a coin?
*August 11, 2009 by Twg*

**MATH Prob.**

There are 6 contestants in a singing competition. How many different ways can first, second, and third place be awarded?
*August 20, 2009 by Twg*

**precalculus**

put this in trigonometric form: -3-i
*May 26, 2008 by bill*

**trig**

What is the trigonometric notation for 3-3(sqrt3i)?
*April 17, 2011 by Jackie*

**precal**

identify the trigonometric form of -6+6i
*May 20, 2011 by joe*

**Trigonometry**

What does a trigonometric value represent?
*August 21, 2013 by Anonymous*

**Prob and Stats**

In a multiple regression with 5 predictors in a sample of 56 U.S. cities, what would be the critical value for an F test of overall significance at a= .05? A. 2.45 B. 2.37 C. 2.40 D. 2.56
*December 9, 2009 by please help!*

**Calculus**

I'm having difficulty figuring #2 of this prob;em. I'm utterly clueless. Can someone explain it? Please and thank you. y=x 2. List the roots of the function.
*August 18, 2011 by Elee*

**PLEASE HELP - DIVISORS PROB**

What is the probability that a randomly selected divisor of 720 is a multiple of 4? Express your answer as a common fraction.
*November 15, 2012 by failureinmath*

**math**

what is the ffive trigonometric function of sin =2/5 ?
*August 21, 2009 by jhonas*

**math **

find the value of the trigonometric functions
*November 23, 2009 by dq*

**Trigonometry**

How do you express sin4x as a trigonometric function of x?
*February 15, 2010 by Veronica*

**math**

to find of trigonometric ratios of angles 60
*March 9, 2010 by atiqullah*

**trig**

Graph this trigonometric function. y=-4cos(x/2+3.14)+1
*April 15, 2011 by Bob*

**Trigonometry**

what is z= -2-2square root of 3i in trigonometric form.
*December 2, 2012 by Josh G.*

**trig**

what is the correct answer in trigonometric identities. DiViDE ; x^5 + 5x^4 - 2x^3 + 3x^2 + 2x + 1 by x + 3
*February 2, 2012 by mien*

**Calculus 2**

find the integral of x/(x^2+4)dx using trigonometric substitution.
*October 10, 2012 by Heather*

**math**

find the 6 trigonometric functions of tan (-3/8): sin < Ø
*November 27, 2012 by kym*

**Math**

Find in terms of trigonometric function of x Tan(90° + x)
*January 19, 2013 by Riley*

**math**

am having prob..wv zs numb..given that f(x)=x+6/2x,find f(4) and f inverse(x) am not sure abt the answer the frst 1,i get 1.25 and the second oneeee i dnt knw hw to do it
*September 16, 2008 by pallaa*

**MATH Prob.**

How many batting lineups of the nine players can be made for a baseball team if the catcher bats first, the shortstop second, and the pitcher last?
*August 12, 2009 by Twg*

**chem**

I am having a hard time with the following : 50 g HCl + 50g Ca(OH)2=H2O+? amt of CaCl2? I dont know how to set this prob. up.Please HELP!Thank you in advance....
*November 12, 2010 by joann*

**mathematic**

a bag contains 3rdmarbles, 2white and 3green a boy takes at one marble at random. what is the prob that it is either red or white?
*February 2, 2015 by joseph *

**Math**

state the primary trigonometric ratio associated with angle a p(-2,5)
*November 26, 2011 by Nikki*

**math**

The trigonometric function sin(-8 x) is equal to one of following:
*December 13, 2011 by Anonymous*

**maths**

Express sin 2x cos 4x as a sum of trigonometric functions.
*December 23, 2012 by laura*

**maths**

Express sin 2x cos 4x as a sum of trigonometric functions
*December 24, 2012 by tom*

**Math**

Trigonometric identity SinD tanD Simplify please
*February 5, 2013 by Sarah*

**trig**

Solve the equation. Express your answer in trigonometric form. x^5 - 11 = 0
*June 28, 2013 by tony*

**math**

Solve the trigonometric equation from 0¡ã¡Üx¡Ü360 tanx+¡Ì3=0
*June 4, 2015 by Anonymous*

**Trigonometric functions **

Prove that 2pi is the minimum period of f(x) = cos (x)
*September 18, 2015 by Anonymous*

**math prob**

Twelve people attend the first meeting of the Star Wars Club. They exchange e-mail addresses. How many exchanges take place?
*October 6, 2013 by Anonymous*

**Plz Help!I Need to find Hypotheses for prob.**

If 3x - 7 = -4, then x = 1. Write the hypotheses of this statement
*December 2, 2006 by Margie...*

**math**

okay i am comepletely stuck on this math prob....: x + 5y - 10 = 0 x = 2y - 8 i know the answer is -20/7 , 18/7 but i have no idea how they got it so someone PLZ HELP!!!!
*February 26, 2008 by shelby*

**MATH Prob.**

What are the odds in favor of drawing a spade and a heart if drawing from a deck of cards w/o replacement?
*August 11, 2009 by Twg*

**Prob and Stats**

If X is a random variable with distribution X~N(350,110) find (a)P(X<400) and b)P(250<X<400)
*October 4, 2011 by Kathryn*

**algebra**

-720=x-9x plese explain to me how to do this prob step by step
*June 8, 2010 by Anonymous*

**Calculus III**

Derivative of Inverse Trigonometric Functions f(x) = sin(arccos(4x)) What is f'(x)?
*January 22, 2008 by Sean*