Thursday

April 17, 2014

April 17, 2014

Number of results: 191

**alg2**

how would you set this problem up using pascal's triangle? (x+y)5 (raised to the 5th power) 5th row, 6 terms. http://en.wikipedia.org/wiki/Pascal's_triangle 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1 so (x+y)^5 = x^5 + 5x^4y + 10x^3y^2 + .... + y^5
*Wednesday, April 11, 2007 at 7:53pm by sara*

**ALG2**

why is (-125)^-2/3 1/25. why isn't it -1/25?
*Wednesday, March 12, 2008 at 10:31am by Abby*

**ALG2**

recall that a^(-x) = 1/a^x having a negative exponent does not imply you get a negative answer. so (-125)^-2/3 = 1/(-125)^(2/3) = 1/[(-125)^(1/3)]^2 = 1/(-5)^2 = 1/25
*Wednesday, March 12, 2008 at 10:31am by Reiny*

**alg2**

identify the conic section. if its a parabols give the vertex if its a circle, give the center and radius. if it is an ellipse or a hyperbola, give the center and foci. again my teacher said the answer is ellipse with center (-4,4), foci at (-4± V3, 4)
*Monday, June 9, 2008 at 8:48pm by jerson*

**alg2**

but i dont understand how she got it
*Monday, June 9, 2008 at 8:48pm by jerson*

**alg2**

suppose you drop a tennis ball from a height of 15 feet. After the ball hits the floor, it rebounds to 85% of its previous height. How high will the ball rebound after its third bounce. round to the nearest tenth.. my teacher told be the answers 9.2 but i dont know how she got...
*Monday, June 9, 2008 at 9:31pm by jerson*

**alg2**

.85*.85*.85 * 15 = .85^3 * 15 = 9.21
*Monday, June 9, 2008 at 9:31pm by Damon*

**alg2**

run this program given in the lesson to find factors of a) 105, b) 197, and c) 7128 Describe in words the function of f(x) =x - [x]. x>0
*Thursday, September 11, 2008 at 11:44pm by jerson*

**alg2**

function of x equals x minus the absolute value of x, where x is greater than zero.
*Thursday, September 11, 2008 at 11:44pm by Fredr*

**Alg2**

i am realy lost as to how to do this alg 2 problem: find the two real-number solutions of each equation: x^2=100 Can you please explain how to do it? Thanks!:)
*Monday, February 2, 2009 at 8:13pm by amaya*

**Alg2**

take the square root of each side. x=+- 10
*Monday, February 2, 2009 at 8:13pm by bobpursley*

**Alg2**

Rationalize the demoninator of each expression. (9y/x)^4 i have no idea how to do that
*Monday, February 9, 2009 at 10:40pm by Chopsticks*

**Alg2**

whoa wrong equation its (9y/x)^(1/4)
*Monday, February 9, 2009 at 10:40pm by Chopsticks*

**Alg2**

The tangent to a circle may be defined as the line that intersects the circle in a single point, called the point of tangency. If the equation of the circle is x^2 + y^2 = r^2 and the equation of the tangent line is y = mx + b, show r^2(1 + m^2) = b^2 Hint: The quadratic ...
*Thursday, October 22, 2009 at 11:17pm by Allen*

**Alg2**

sub y = mx + b into x^2 + y^2 = r^2 expanding gave me x^2 + m^2x^2 + 2bmx + b^2 - r^2 = 0 a^2(1+m^2) + 2bmx + b^2 - r^2 = 0 comparing this to Ax + By + C = 0 A = 1+m^2 B = 2bm C = b^2 - r^2 we want this quadratic to have only one solution, since there is only one point of ...
*Thursday, October 22, 2009 at 11:17pm by Reiny*

**Alg2**

A piece of wood discovered in an archaeological dig was found to have lost 62% of it's carbon-14. Carbon-14 has a half-life of 5630 years. Determine it's age.
*Tuesday, June 1, 2010 at 9:51pm by Cal*

**Alg2**

I would use the equation amount = initialvalue(1/2)^(t/half-life) so .62 = 1(1/2)^(t/5630) ln .62 = (t/5630)ln .5 t/5630 = ln .62/ln .5 = .689659879 t = 3882.785 The age is appr. 3883 years
*Tuesday, June 1, 2010 at 9:51pm by Reiny*

**alg2**

Describe the end behavior for the graph of y= 12x^6 + 4x^4 - x^3 + 6x +1
*Sunday, January 9, 2011 at 10:48pm by morgen*

**alg2**

if you graph x from - 1 to 1 the graph looks like a U not much help, but you really need to plot yourself from -0.8 to 0.6 the graph dips in a little u then rises steadily up, up and up to the right
*Sunday, January 9, 2011 at 10:48pm by Anonymous*

**alg2**

for the graph: y>x^2+9 what is the range?
*Wednesday, January 19, 2011 at 11:39pm by exam tomorrow! help*

**alg2**

Solve: 3x − 7 (sqrt x) + 2 = 0
*Thursday, January 20, 2011 at 12:05am by katie*

**alg2**

3x ΓΆΛ†β€™ 7 (sqrt x) + 2 = 0 -7(sqrt x) = -3x - 2 divide both sides by -7 (sqrt x) = 1/7(3x + 2) square both sides x = 1/49 (3x + 2)^2 expand the right side you will have a quadratic equation that can be solved either by completing the square or using the quadratic formula
*Thursday, January 20, 2011 at 12:05am by helper*

**Alg2**

When there is no repetition of the letters, the number of permutations (order counts) is nPr, taking r letters at a time n!/(n-r)!. If all n letters are taken (as in the present case) to make the word, nPn reduces to n!/(n-n)!=n!/0!=n!/1 = n! However, if there are repetitions ...
*Wednesday, November 30, 2011 at 11:23pm by MathMate*

**Alg2**

how many ways can 5 members of the 100 member US senate be chosen to be put on a committe?
*Wednesday, November 30, 2011 at 11:20pm by Rock*

**Alg2**

what is the # of possibilities of buying 2 CD's from 10 that are on sale?
*Wednesday, November 30, 2011 at 11:22pm by Rock*

**Alg2**

what is the number of possibilities of arrangements of the letters in the word intercept?
*Wednesday, November 30, 2011 at 11:23pm by Rock*

**Alg2**

what are the # of possibilities of buying 2 CD's from 10 that are on sale?
*Thursday, December 1, 2011 at 10:51pm by Rock*

**Alg2**

10*9/2 = 45
*Thursday, December 1, 2011 at 10:51pm by Steve*

**Alg2**

# of possibilities of arrangements for the word intercept?
*Saturday, December 3, 2011 at 12:22pm by Rock*

**Alg2**

A video store has 8 new releases this week. Each is available on videotape and on DVD. How many ways can a customer choose a new release and a format to rent? answer here How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it ...
*Saturday, December 3, 2011 at 12:31pm by Rock*

**Alg2**

intercept has 9 letters 2 t's 2 e's so, 9!/2!2!
*Saturday, December 3, 2011 at 12:22pm by Steve*

**Alg2**

I need more help
*Sunday, December 4, 2011 at 12:05pm by Rock*

**Alg2**

You have to ask a question.
*Sunday, December 4, 2011 at 12:05pm by bobpursley*

**Alg2**

How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?
*Sunday, December 4, 2011 at 2:24pm by Rock*

**Alg2**

I need help with problem solving...
*Sunday, December 4, 2011 at 2:20pm by Rock*

**Alg2**

For a college application, Macawi must select one of five topics on which to write a short essay. She must also select a different topic from the list for a longer essay. How many ways can she choose the topics for the two essays?
*Sunday, December 4, 2011 at 2:23pm by Rock*

**Alg2**

For the first essay, she has 5 choices. For the second, she cannot repeat the same topic, so she is left with 5-1=4 choices. By the multiplication principle, she has ? choices?
*Sunday, December 4, 2011 at 2:23pm by MathMate*

**Alg2**

Find all the arrangements for 5 books, and multiply by two, i.e. putting the dictionary at either end.
*Sunday, December 4, 2011 at 2:24pm by MathMate*

**Alg2**

20
*Sunday, December 4, 2011 at 2:23pm by Rock*

**Alg2**

Correct!
*Sunday, December 4, 2011 at 2:23pm by MathMate*

**Alg2**

YaY!!!!!
*Sunday, December 4, 2011 at 2:23pm by Rock*

**Alg2**

240
*Sunday, December 4, 2011 at 2:24pm by Rock*

**Alg2**

Perfect!
*Sunday, December 4, 2011 at 2:24pm by MathMate*

**Alg2**

Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?
*Sunday, December 4, 2011 at 7:20pm by Rock*

**Alg2**

Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?
*Sunday, December 4, 2011 at 2:24pm by Rock*

**Alg2**

Sorry Rock. Please make a new post. Tagging on an existing post will only slow down your response. Thanks.
*Sunday, December 4, 2011 at 2:24pm by MathMate*

**Alg2**

Thanks, I did!
*Sunday, December 4, 2011 at 2:24pm by Rock*

**Alg2**

s(L)=2√(5L) Substitute L=120 in above equation to get: s(120)=2√(5(120)) =2√(600) =2*24.5 =49 mph
*Sunday, December 4, 2011 at 7:20pm by MathMate*

**Alg2**

I can See It!!! I was multiplying 600 & 2 together... Thanks :)
*Sunday, December 4, 2011 at 7:20pm by Rock*

**Alg2**

You're welcome!
*Sunday, December 4, 2011 at 7:20pm by MathMate*

**Alg2**

Zeus Industries bought a computer for $2500. It is expected to depreciate at a rate of 20% per year. What will the value of the computer be in 2 years?
*Tuesday, December 6, 2011 at 9:48pm by Rock*

**Alg2**

2500 * 0.8 = 2000 2000 * 0.8 = 1600
*Tuesday, December 6, 2011 at 9:48pm by Ms. Sue*

**Alg2**

Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.
*Tuesday, December 6, 2011 at 9:50pm by Rock*

**Alg2**

An anthropologist finds there is so little remaining Carbon-14 in a prehistoric bone that instruments cannot measure it. This means that there is less than 0.5% of the amount of Carbon-14 the bones would have contained when the person was alive. How long ago did the person die...
*Tuesday, December 6, 2011 at 9:50pm by Rock*

**Alg2**

The annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...
*Tuesday, December 6, 2011 at 9:50pm by Rock*

**Alg2**

The Mendes family bought a new house 10 years ago for $120,000. The house is now worth $191,000. Assuming a steady rate of growth, what was the yearly rate of appreciation? Round your answer to the nearest tenth of a percent (1.2% etc)
*Tuesday, December 6, 2011 at 9:51pm by Rock*

**Alg2**

he annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...
*Wednesday, December 7, 2011 at 10:55pm by Rock*

**Alg2**

Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.
*Thursday, December 8, 2011 at 7:37pm by Rock*

**Alg2**

If you can express the amount as y = a*2^(-t/n) then the half-life is n years. That is, as t increases by n, the amount is multiplied by 1/2 ae^-.0856t = a*2^(-t/n) divide by a and take logs -.0856t = -t/n ln 2 divide by t .0856 = ln2/n n = ln2/.0856 = .6931/.0856 = 8.1 So, ...
*Thursday, December 8, 2011 at 7:37pm by Steve*

**Alg2**

An anthropologist finds there is so little remaining Carbon-14 in a prehistoric bone that instruments cannot measure it. This means that there is less than 0.5% of the amount of Carbon-14 the bones would have contained when the person was alive. How long ago did the person die...
*Friday, December 9, 2011 at 8:09pm by Rock*

**Alg2**

the annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, ...
*Friday, December 9, 2011 at 10:07pm by Rock*

**Alg2**

Find the half-life of C14. Call it n years 2^(-t/n) < .005 -t/n < ln(.005)/ln(2) = -7.64 t > 7.64n check: 2^-7.64 = .005013, so after 7.64 half-lives, we are down to .5% of the original.
*Friday, December 9, 2011 at 8:09pm by Steve*

**Alg2**

Can't figure this one out...The Mendes family bought a new house 10 years ago for $120,000. The house is now worth $191,000. Assuming a steady rate of growth, what was the yearly rate of appreciation? Round your answer to the nearest tenth of a percent (1.2% etc)
*Sunday, December 11, 2011 at 2:55pm by Rock*

**Alg2**

Help...Please... You buy a commemorative coin for $25. The value of the coin increases 3.25% per year. How much will the coin be worth in 15 years? Round to the nearest cent.
*Monday, December 12, 2011 at 10:25pm by Rock*

**Alg2**

Help....Help... Suppose you deposit a principal amount of p dollars in a bank account that pays compound interest. If the annual interest rate r (expressed as a decimal) and the bank makes interest payments n times every year, the amount of money A you would have after t years...
*Monday, December 12, 2011 at 10:27pm by Rock*

**Alg2**

Please Help... You buy a commemorative coin for $25. The value of the coin increases 3.25% per year. How much will the coin be worth in 15 years? Round to the nearest cent.
*Tuesday, December 13, 2011 at 8:17pm by Rock*

**Alg2**

what is 25(1.0325)^15 ?
*Tuesday, December 13, 2011 at 8:17pm by Reiny*

**Alg2**

387.187
*Tuesday, December 13, 2011 at 8:17pm by Rock*

**Alg2**

no,,,, 25(1.0325)^15 = 25(1.61566.. =40.39
*Tuesday, December 13, 2011 at 8:17pm by Reiny*

**Alg2**

plug in all your info into the formula ( you have extra information) S(n) = a(r^n -1)/(r-1) 781 = a(5^5 - 1)/(5-1) 781 = a(3124/4) 781 = 781a a = 1 check: t(5) = 1(5^4) = 625
*Sunday, January 15, 2012 at 7:19pm by Reiny*

**Alg2**

If the sum of a geometric series is 781, the number of terms is 5, the common ratio is 5 and the last term is 625, what is the first term a1?
*Sunday, January 15, 2012 at 7:19pm by Embraced*

**Alg2**

Solve the equation -5e^-x + 9 = 6 I subtracted 9 to both sides and got: -5e^-x= -3 < this is where I'm stuck at.
*Thursday, February 2, 2012 at 1:53am by Yolie*

**Alg2**

- 5e ^ ( - x ) + 9 = 6 - 5e ^ ( - x ) = 6 - 9 - 5e ^ ( - x ) = - 3 Divide both sides by - 5 e ^ ( - x ) = 3 / 5 Take the natural logarithm of both sides: - x = - log (5 / 3 ) Divide both sides by -1: x = log ( 5 / 3 ) x = 0.510826 Remark: log mean natural logarithm
*Thursday, February 2, 2012 at 1:53am by Anonymous*

**Alg2**

Tysm :D
*Thursday, February 2, 2012 at 1:53am by Yolie*

**ALG2**

x2 + bx + c and ax2 + bx + c could you factor this and explain it.
*Wednesday, February 29, 2012 at 9:50am by KAYG*

**ALG2**

take a look in your book or online for a proof of the quadratic formula. Its derivation shows how to factor these.
*Wednesday, February 29, 2012 at 9:50am by Steve*

**Alg2**

How how I write the first six terms of this sequence? Please be detailed and thanks in advance :) f(n)= 3/-m
*Monday, March 12, 2012 at 1:34am by Lily*

**Alg2**

typo, variables don't match
*Monday, March 12, 2012 at 1:34am by Reiny*

**Alg2**

Hi! I'd like to know how to write the next term in the sentence & write a rule for the nth term. 1) 2/3, 3/6, 4/9, 5/12... I know the next term is 6/15 but I don't know how to write the rule for the nth term... 2) 1/3, 1, 5/3, 7/3,... I don't get this one at all ): Please and ...
*Thursday, March 15, 2012 at 3:08am by Lihn*

**Alg2**

my bad ^^; its not sentence, its sequence...
*Thursday, March 15, 2012 at 3:08am by Please check my answer (:*

**Alg2**

An =(n+1)/3n ? A(n+1) = An + 2/3 or An = 1/3 +(2/3)(n-1)
*Thursday, March 15, 2012 at 3:08am by Damon*

**Alg2**

Ty Damon ^^
*Thursday, March 15, 2012 at 3:08am by Lihn*

**Alg2**

You are playing a game that involves drawing three numbers from a hat. There are 25 pieces of paper numbered 1 to 25 in the hat. Each number is replaced after it is drawin. What is the probability that each number is greater than 20 or less than 4 ?
*Wednesday, April 18, 2012 at 1:51am by Cindy*

**Alg2**

Find the value of c that will make the expression x^2-15x+c a perfect square. would c = 56.25 ?
*Monday, May 7, 2012 at 3:26am by Cyn*

**Alg2**

yes
*Monday, May 7, 2012 at 3:26am by Reiny*

**Alg2**

Solve the system for z. 2x - y + 2z = 11 x - 2y - 3z = -5 -3x + z = -3
*Tuesday, May 8, 2012 at 1:27am by Sira*

**Alg2**

- 3 x + z = - 3 Add 3 x to both sides - 3 x + 3 x + z = - 3 + 3 x z = 3 x - 3 x - 2 y - 3 z = - 5 x - 2 y - 3 * ( 3 x - 3 ) = - 5 x - 2 y - 3 * 3 x - 3 * ( - 3 = - 5 x - 2 y - 9 x + 9 = - 5 - 8 x - 2 y + 9 = - 5 Add 8 x - 9 to both sides - 8 x - 2 y + 9 + 8 x - 9 = - 5 + 8 x...
*Tuesday, May 8, 2012 at 1:27am by Bosnian*

**Alg2**

Find a quadratic equation with integral coefficients having roots 1/2 and -5/2.
*Wednesday, May 9, 2012 at 1:20am by Sira*

**Alg2**

A geometric sequence has a common ratio of 4. If the fifth term in the sequence is 2256, what is the second term?
*Wednesday, May 9, 2012 at 1:55am by Anon*

**Alg2**

if the roots are 1/2 and -5/2, then the quadratic would have factored to (2x-1)(5x+2) = 0 expand and you are done
*Wednesday, May 9, 2012 at 1:20am by Reiny*

**Alg2**

ar^3 = 2256 a(4^3) = 2256 a=2256/64 = 35.25 or 141/4 second term is ar = (141/4)(4) = 141
*Wednesday, May 9, 2012 at 1:55am by Reiny*

**alg2**

how do i solve for: 2^(x+1) =9 3e^(x-8) +5=14 log2x=4 and ln(2x-5)=4? thanks!
*Saturday, May 19, 2012 at 2:05pm by bkue*

**alg2**

first: take log of each side (x+1)log2=log9 solve for x second : take ln of reach side ln3+(x-8)=ln9 third log2x=4 2x=10,000
*Saturday, May 19, 2012 at 2:05pm by bobpursley*

**alg2**

solve for 10/x^2-2x + 4/x = 5/x-2 3x/x+1 + 6/2x = 7/x 8(x-1)/x^2-4 = 4/x-2 check for any extraneous solutions! thanks!
*Saturday, May 19, 2012 at 8:27pm by skye*

**alg2**

I'll do one, and you try the others. If you get stuck, come on back. 10/(x^2-2x) + 4/x = 5/(x-2) x^2-2x = x(x-2), so that's the LCD. Multiply through to get 10 + 4(x-2) = 5x 10 + 4x - 8 = 5x x = 2 Unfortunately, the original equation has (x-2) in the denominator, so it is ...
*Saturday, May 19, 2012 at 8:27pm by Steve*

**ALG2!**

-3K - 8 is less than or equal to 5k .....solve please
*Thursday, October 4, 2012 at 8:23pm by tyneisha*

**ALG2!**

1.7 - 0.78>5 solve please
*Thursday, October 4, 2012 at 8:24pm by tyneisha*

**ALG2!**

add 3 k to each side -3k-8>=5k -8>=8k divide each side by 8 -1>=k or k<=-1
*Thursday, October 4, 2012 at 8:23pm by bobpursley*

**ALG2!**

- 3 k - 8 < = 5 k Subtract 5 k to both sides - 3 k - 8 - 5 k < = 5 k - 5 k - 8 k - 8 < = 0 Add 8 to both sides - 8 k - 8 + 8 < = 0 + 8 - 8 k < = 8 Divide both sides by - 8 ________________________________________ Remark : If you multiply or divide both sides of ...
*Thursday, October 4, 2012 at 8:23pm by Bosnian*

**ALG2 **

If Y varies inversely as X^2, determine what Y would be if X = 2 and another point on the equation is (1,8). The answer I got was y=1/2^2=1/4 I'm not sure I worked this out correctly, is this correct?
*Friday, December 28, 2012 at 8:20pm by Yvette B.*