Sunday
April 20, 2014

Homework Help: Math: Algebra

Recent Homework Questions About Algebra

Post a New Question | Current Questions

College Algebra
The number of crimes that occurred in a certain city per 1000 people had decreased from 45.6 in 1920 to 45.1 in 1970. Find the average rate of change in the number of crimes per 1000 people that occurred from 1920 to 1970.
Saturday, April 19, 2014 at 6:48pm

elem algebra
let speed of boat in still water be x mph 17/(x-10) + 17/(x+10) = 10 time (x-10)(x+10) 17(x+10) + 17(x-10) = 10(x^2 - 100) 34x = 10x^2-1000 10x^2 -34x - 1000 = 0 x = 11.84 or some negative speed x = 11.84
Saturday, April 19, 2014 at 4:29pm

elem algebra
the current in a stream moves at a speed of 10 mph. a boat travels 17 mi upstream and 17 mi downstream in a total time of 10 hr. What is the speed of the boat in still water?
Saturday, April 19, 2014 at 3:27pm

college algebra
?
Saturday, April 19, 2014 at 2:50pm

Algebra
Divide both numerator and denominator by 2.
Saturday, April 19, 2014 at 1:17pm

algebra 117
g(x) = f(x-15) = ((x-15)+8)^2 = (x-7)^2
Saturday, April 19, 2014 at 5:10am

algebra
since the speed difference is 2 km/hr, (1/4 km) / (2 km/hr) = 1/8 hr
Saturday, April 19, 2014 at 5:08am

algebra
since water is 0% acid, .40(20) + 0x = .30(20+x) Now just solve for x Or, since you want 3/4 the concentration, the final volume must be 4/3 the starting volume.
Saturday, April 19, 2014 at 5:07am

algebra
Rj and Joshua are running in the fun run. Rj runs at 7kph and Joshua at 5kph. if they start at the same time, how long will it be before Rj is 1/4 km ahead of Joshua?
Saturday, April 19, 2014 at 4:06am

algebra
how many liters of water should be added to a 20 liters of 40% acid solution to obtain a 30% acid solution?
Saturday, April 19, 2014 at 4:01am

Algebra
haha
Saturday, April 19, 2014 at 12:31am

Algebra
perpendicula line slope= -1 y=-x+b and at -7,1 1=7+b or b=-6 equation of perpendcular then is y= -x-6
Friday, April 18, 2014 at 11:05pm

Algebra
finding the equation to the perpendicular lines. y=x+4; (-7,1)
Friday, April 18, 2014 at 10:53pm

algebra 117
f(x)= (x+8)^2 right 15 units
Friday, April 18, 2014 at 10:12pm

Algebra
Thank you, now I can.
Friday, April 18, 2014 at 8:21pm

Algebra
Sandra, the placing of brackets is crucial here The way you placed them makes them insignificant, it is the same thing as 3/2a + 5/2a According to the rules of operations, this is the same as (3/2)a + (5/2)a = (8/2)a = 4a so you must have meant: 3/(2a) + 5/(2a) , the way both ...
Friday, April 18, 2014 at 8:01pm

Algebra
PsyDAG told you the answer is 8/2a. I told you to simplify his answer. What is 8 divided by 2?
Friday, April 18, 2014 at 6:53pm

Algebra
get a common denominator... 2a now add the numerators Put the numerators over the common denominator. Reduce the fraction. I will be happy to check your work
Friday, April 18, 2014 at 6:52pm

Algebra
Add: (3/2a) + (5/2a) Possible answers: 8/4a, 2/a, 15/4a2^ or 4/a
Friday, April 18, 2014 at 6:50pm

Algebra 1
4P+5p=2.00 3P+4p=1.58 P= cost of a Pencil p=cost of a pen
Friday, April 18, 2014 at 6:43pm

Algebra 1
4 pencils and 5 pens cost $2.00; 3 pencils and 4 pens cost $1.58. Write out a system of equations that would represent this situation.
Friday, April 18, 2014 at 6:31pm

Algebra
PsyDAG's answer is one of your choices. You'll need to simplify his answer, though.
Friday, April 18, 2014 at 3:24pm

Algebra
Thank you, it helps to know how...
Friday, April 18, 2014 at 2:46pm

Algebra
Thank you, but I don't know how. I will post the problem again. Those in the know should know the correct answer whether posted or not.
Friday, April 18, 2014 at 2:33pm

Algebra
put it all over (x+4) and you have (8(x+4) + (x-1))/(x+4) = (9x+31)/(x+4)
Friday, April 18, 2014 at 2:31pm

Algebra
When you're given choices, please post them in your original post. Simplify PsyDAG's answer.
Friday, April 18, 2014 at 1:56pm

Algebra
Add... 8 + (x-1) / (x+4)
Friday, April 18, 2014 at 1:45pm

Algebra
Thank you but that is not one of the answers we can use: 8/4a, 2/a, 15/4a2^ or 4/a are the choices.
Friday, April 18, 2014 at 1:44pm

Algebra
8/2a
Friday, April 18, 2014 at 12:11pm

Algebra
Add (3/2a) + (5/2a)
Friday, April 18, 2014 at 10:42am

Algebra
If using x lbs of 4% milk, .04x + .30(200-x) = .08(200)
Thursday, April 17, 2014 at 11:36pm

Algebra
The bar graph which is 4% whole mil, 8% milk for cream and 30% cream shows the milk fat percentages in three dairy product s. How many pounds each of whole milk and cream should be mixed to form 200 lb of milk for cream cheese?
Thursday, April 17, 2014 at 9:43pm

Algebra 1
what you need is the vertex. for any parabola of the form y = ax^2 + bx + c the x of the vertex is -b/(2a) once you have the x of the vertex, plug into the original to get y y will be your maximum, and it happens at the x value. (make sure you get a max height of 156.25 ft )
Thursday, April 17, 2014 at 9:20pm

Algebra 1
h=-16x^2+100x=x(100-16x) when is h zero? answer, when x= 100/16, and x=0 IT is a parabola, so the max apex is at 1/2 the time between the zeroes, or at time= 100/32 use that x to find max height in the original formula.
Thursday, April 17, 2014 at 9:17pm

Algebra 2
e^3x>e^x-1 you probably meant: e^(3x) > e^(x-1), (huge difference from what you typed) ln both sides ln (e^(3x)) > ln e^(x-1) 3x > x-1 2x > -1 x > -1/2 PROOF: http://www.wolframalpha.com/input/?i=plo​t+y+%3D+e%5E%283x%29+%2C+y+%3D+e%5E%28x-​1%29+...
Thursday, April 17, 2014 at 9:15pm

Algebra
6300=x + Y .11x + .08y=597 cna you take if from here?
Thursday, April 17, 2014 at 9:15pm

Algebra 1
The height in feet of a baseball after it is hit can be modeled by the function f(x) =-16x^2 + 100x, where x is the time in seconds after the ball is hit. Find the ball's maximum height and the time it takes the ball to reach this height. Then find how long the ball is in ...
Thursday, April 17, 2014 at 9:14pm

Algebra
$6300 is invested, part of it at 11% and part of it at 8%. For a certain year, the total yield is $597.00. How much was invested at each rate?
Thursday, April 17, 2014 at 9:13pm

Algebra 2
How do I solve these inequalities: e^3x>e^x-1 -6log (subscript of 4) x > -24 & how do I solve these: 8^x+1=3 e^x+2=50 8logx=16 I really don't understand how to solve these so can someone please explain them to me?
Thursday, April 17, 2014 at 8:45pm

Algebra
I always appreciate showing how it is done.
Thursday, April 17, 2014 at 6:34pm

Algebra
cross multiply to clear the fractions and you have (x+12)(x+8) = x(x+4) x^2+20x+96 = x^2+4x 16x = -96 x = -6
Thursday, April 17, 2014 at 6:23pm

Algebra
Solve... (x+12) / (x+4) = (x) / (x+8)
Thursday, April 17, 2014 at 6:03pm

Algebra
When x increases by 1, y increases by 10.
Thursday, April 17, 2014 at 6:03pm

Algebra
Describe the pattern in the table using an equation: x|y 1|15 2|25 3|35 4|45
Thursday, April 17, 2014 at 5:59pm

algebra
I was going to answer you, but then I tripped so I couldn't. Just kidding. The square root of 8 is a constant. It does not change as x changes. Therefore the graph would look like a line rather than a square root curve. In order for the function to be a square root ...
Thursday, April 17, 2014 at 1:18pm

algebra - incomplete
.
Thursday, April 17, 2014 at 1:17pm

algebra
y= (the square root of 8) + x determine whether the following are square root functions. explain
Thursday, April 17, 2014 at 1:15pm

Algebra
That is a great help, thanks.
Thursday, April 17, 2014 at 12:31pm

Algebra
not sure what you want to do. If you just want to do long division, visit calc101.com and click on the "long division" button. Enter your polynomials and see all the details.
Thursday, April 17, 2014 at 12:30pm

Algebra
the function is undefined when you try to divide by zero. So, if b+4=0, the function is undefined.
Thursday, April 17, 2014 at 12:00pm

Algebra
If he intended to buy x dozen, the price was evidently 210/x cents/dozen. Instead, (x-1/2)(210/x + 3) = 209 x = 6 So, the price per dozen was expected to be $.35 Instead, he wound up paying $.38/doz, meaning he bought 5 1/2 dozen, which cost $2.09
Thursday, April 17, 2014 at 11:55am

Algebra
anticipated cost/doz --- x anticipated number of dozen bought = 210/x actual cost/doz = x+3 number of dozen he bought = 210/(x+3) 210/x - 210/(x+3) = 1/2 multiply each term by 2x(x+3) 420(x+3) - 420x = x^2 + 3x x^2 + 3x - 1260 = 0 x = appr 34.03 or some negative value 210/34...
Thursday, April 17, 2014 at 11:52am

Algebra
If (10 / 3x) + (4/3) = (7 + x) / (2x) mean 10 / ( 3 x ) + 4 / 3 = ( 7 + x ) / ( 2 x ) then Multiply both sides by x 10 * x / ( 3 x ) + 4 * x / 3 = x * ( 7 + x ) / ( 2 x ) 10 / 3 + 4 x / 3 = ( 7 + x ) / 2 Multiply both sides by 6 10 * 6 / 3 + 6 * 4 x / 3 = 6 *( 7 + x ) / 2 10...
Thursday, April 17, 2014 at 11:22am

Algebra
your LCD is 6x , so multiply each term by that 20 + 8x = 3(7+x) 20+8x = 21+3x 5x = 1 x = 1/5
Thursday, April 17, 2014 at 11:12am

Algebra
Solve? (10 / 3x) + (4/3) = (7 + x) / (2x)
Thursday, April 17, 2014 at 10:33am

Algebra
Okey, thanks
Thursday, April 17, 2014 at 10:32am

Algebra
A boy was sent with $2.10 to buy oranges. He found the price 3 cents higher per dozen than he had expected to pay, and so he bought 6 fewer oranges than he had intended to buy and received 1 cent in change. How much did he pay for a dozen oranges?
Thursday, April 17, 2014 at 9:46am

Algebra
I will assume you meant: 1/(2x) + 1/x = -12 times 2x 1 + 2 = -24x x = 3/-24 = -1/8 if you meant it the way it was typed: 1/2 x + 1/x = -12 times 2x x^2 + 2 = -24x x^2 + 24x + 2 = 0 x = (-24 ± √568)/2 = -12 ± √142
Thursday, April 17, 2014 at 9:20am

Algebra
What you meant was ... For what value of b is the expression undefined? when b = -4, the denominator is zero, and you would be dividing by zero. Division by zero is undefined, so b ≠ -4
Thursday, April 17, 2014 at 9:15am

Algebra
What is the undefined value of... (3b^2 + 13b + 4) / (b + 4)
Thursday, April 17, 2014 at 12:43am

Algebra
Why are you asking me this question? I have no idea. I am the one who needs help.
Thursday, April 17, 2014 at 12:42am

Algebra
you can ride the subway one-way for $.85. Monthly pass cost $27.00 For what number of rides is it cheaper to pay the one-way fare than to buy the monthly pass?
Thursday, April 17, 2014 at 12:06am

Algebra
How can I solve 1/2x+1/x=-12?
Wednesday, April 16, 2014 at 11:28pm

Algebra
What is the undefined value of... (3b^2 + 13b + 4) / (b + 4)
Wednesday, April 16, 2014 at 10:48pm

Algebra
3/(4x-36)- 5/(2x-4) - 2x/(x^2-11x+18) = 3/(4(x-9) ) - 5(2(x-2)) - 2x/( (x-9)(x-2)) so the LCD = 4(x-9)(x-2) = ( 3(x-2) - 5(2)(x-9) - 2x(4) )/(4(x-9)(x-2)) = (3x-6 - 10x + 90 - 8x)/(4(x-9)(x-2)) = (84 - 15x)/(4(x-9)(x-2))
Wednesday, April 16, 2014 at 9:51pm

Algebra
(y^3-y^2-4y-7)/(y+1) can someone show me how to do this?
Wednesday, April 16, 2014 at 9:17pm

Algebra
3/(4x-36)- 5/(2x-4) - 2x/(x^2-11x+18) Simplify and expand the expression?
Wednesday, April 16, 2014 at 8:38pm

Algebra
Thank you, that was strange. It really helps to see the steps to get to the answer. I understand it better.
Wednesday, April 16, 2014 at 6:38pm

algebra
you just have a right triangle with legs 5 and 8. So, the rope, forming the hypotenuse is √(25+64) = √89
Wednesday, April 16, 2014 at 3:47pm

@ Sandra - Algebra
Looks like Connexus is new to this site, looks like he just added his question to yours. about yours ..... (x^2 – 1) / (x^2 – x – 2) – (x-1) / (x-2) = (x+1)(x-1)/( (x-2)(x+1) - (x-1)/(x-2) = (x-1)/(x-2) - (x-1)/(x-2) = 0 , x ≠ -1
Wednesday, April 16, 2014 at 3:42pm

Calculus Help!!!!!
should be no problem. That's just Algebra II. Anyway, y = x^3/(x+1)^2 y' = x^2(x+3)/(x+1)^3 y" = 6x/(x+1)^4 see the graph and some analysis here: http://www.wolframalpha.com/input/?i=x^3​%2F%28x%2B1%29^2
Wednesday, April 16, 2014 at 3:29pm

algebra
Right!
Wednesday, April 16, 2014 at 2:15pm

Algebra 2
term1= 3(1) - 3 = 0 term2 = 3(2) - 3 = 3 term3( = 3(3) - 3 = 6 .... looks like an arithmetic sequence , with a=0 and d = 3 sum(1) = (10/2)(2(0) + 9(3)) = 5(27) = 135
Wednesday, April 16, 2014 at 2:09pm

algebra
A guy rope is attached to the top of a tent pole. The tent pole is 8 feet tall. If the guy rope is pegged into the ground 5 feet from the tent, how long is the guy rope?
Wednesday, April 16, 2014 at 1:50pm

Algebra
I have no idea what those questions are about. Never heard of them. What is Connexus?
Wednesday, April 16, 2014 at 1:38pm

Algebra 2
What is the sum of the first 10 terms of the sequence defined by an = 3n - 3?
Wednesday, April 16, 2014 at 12:44pm

Algebra
x=0 Now answer this In the 1800s, it was believed women were good at working on projects to improve the community because (5 points) women were better leaders than men. women were better planners than men. women were more emotional than men. women were more moral than men. 2. ...
Wednesday, April 16, 2014 at 12:37pm

Algebra
Subtract (x^2 – 1) / (x^2 – x – 2) – (x-1) / (x-2)
Wednesday, April 16, 2014 at 12:34pm

Algebra
2 hours
Wednesday, April 16, 2014 at 10:51am

Algebra
Edie can paint a wall in 3 hours. Dan can paint the same wall in 6 hours. If they work together, how many hours will it take Edie and Dan to paint the wall?
Wednesday, April 16, 2014 at 10:50am

Algebra
Thanks much
Wednesday, April 16, 2014 at 10:48am

algebra
oh my god math is terrible
Wednesday, April 16, 2014 at 8:36am

Algebra
the point of Reiny's question is to remind you that division by zero is undefined. So, when b+4=0, the expression cannot be evaluated. That is, when b = -4, the expression is undefined.
Wednesday, April 16, 2014 at 5:52am

Algebra
since time = distance/speed, we have 5/x + 5/(2x) = 15/(2x)
Wednesday, April 16, 2014 at 5:43am

math (Matrix algebra)
assuming you mean a determinant, and calling your matrix M, I get |M| = 31-3x So, if 31-3x = 25, x=2 The inverse can be seen at http://www.wolframalpha.com/input/?i=inv​erse+{{-2%2C+1%2C+x%2B2}%2C{3%2C+x-4%2C+​5}%2C{0%2C+1%2C+3}}+ substitute in x=2 if you just want...
Wednesday, April 16, 2014 at 5:38am

math (Matrix algebra)
Enter your data at http://www.gregthatcher.com/Mathematics/​GaussJordan.aspx to see all the details
Wednesday, April 16, 2014 at 5:33am

math (Matrix algebra)
solve the equations by using a) the adjoint matrix b) elementary row operations i) x+y+z=6 2x-y+z=3 x+4y-z=6 ii) 3p-3q+r=1 -3p+5q-2r=-1 p-2q+r=3 iii)-12a+b+17c=-14 2a-b+3c=5 8a+b-13c=-3 thanks sir/madam
Wednesday, April 16, 2014 at 4:10am

math (Matrix algebra)
if (-2 1 x+2 ) (3 x-4 5 ) =25 (0 1 3 ) p/s : all the value above in one bracket ( ) a) find the value of x b) hence ,find (-2 1 x+2 )^-1 ( 3 x-4 5 ) (o 1 3 ) p/s : all the value above in one bracket ( )
Wednesday, April 16, 2014 at 4:08am

math (Matrix algebra)
solve the equations by using a) the adjoint matrix b) elementary row operations i) x+y+z=6 2x-y+z=3 x+4y-z=6 ii) 3p-3q+r=1 -3p+5q-2r=-1 p-2q+r=3 iii)-12a+b+17c=-14 2a-b+3c=5 8a+b-13c=-3 thanks sir/madam
Wednesday, April 16, 2014 at 3:42am

mathematics (matrix algebra)
if (-2 1 x+2 ) (3 x-4 5 ) =25 (0 1 3 ) a) find the value of x b) hence ,find (-2 1 x+2 )^-1 ( 3 x-4 5 ) (o 1 3 ) p/s : all the value above IS COMBINE in one bracket ( )
Wednesday, April 16, 2014 at 3:41am

Algebra
John walked 10 miles on Saturday. He walked twice as fast on the second 5 miles of his walk than he walked on the first 5 miles of his walk. Which expression represents the time he spent walking? Let x = John's speed on the first half of his walk.
Wednesday, April 16, 2014 at 12:35am

Algebra
That really helps, thanks.
Wednesday, April 16, 2014 at 12:24am

Algebra
x^2+8x+15 = (x+3)(x+5) so, you have (x+3)(x+5)/(x-4) * (x-4)(x+4)/2(x+3) the x+3 and x-4 cancel, leaving (x+5)(x+4)/2
Wednesday, April 16, 2014 at 12:19am

Algebra
Multiply (x^2 + 8x + 15) / x – 4 * (x^2 – 16) / 2x + 6
Wednesday, April 16, 2014 at 12:06am

algebra
a data set has the following points (0,2) (4,1) (6,0) the slope of the linear regression line is -0.32
Tuesday, April 15, 2014 at 11:38pm

Algebra
I doubt it. Set 3 and 5 into a fraction, like t / 3 + t / 5 = 1. Multiply the denominator, to give you 15. You'll be left with 5t + 3t = 15 8t = 15 8t / 8 = 15 / 8 t = 1.875 = 1.9 min., or 1 min. and 55 seconds
Tuesday, April 15, 2014 at 11:05pm

Algebra
It would take 2 minutes to complete the task with two people. All you have to do is subtract.
Tuesday, April 15, 2014 at 10:16pm

Algebra
One person can complete a task in 3 minutes. A second person can complete the same task in 5 minutes. How long will it take to complete the task of the two people work together?
Tuesday, April 15, 2014 at 10:06pm

Algebra
I don't understand your question since I don't know the value of b.
Tuesday, April 15, 2014 at 9:47pm

Algebra
For what value of b would you be dividing by zero ?
Tuesday, April 15, 2014 at 9:32pm

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Homework Help: Math

Search
Members