Sunday

April 20, 2014

April 20, 2014

**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=plot+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=inverse+{{-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*

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