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Linear-equations/460872: Describe the line containing the points:
(-4,-6) and (11,-6)

1 solutions

Answer 316123 by rwm(914) on 2011-06-14 10:00:07 (Show Source):

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y=-6
Horizontal line below the origin. slope of zero

Travel_Word_Problems/460775: how do u find out how fast you have to go if you wanted to trave 1 mile in 3.5 minutes
1 solutions

Answer 316107 by rwm(914) on 2011-06-14 08:01:57 (Show Source):

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r*t=d
rate(speed) * time =distance
r*3.5=1
r=1/3.5=2/7 miles per minute
r=60*1/3.5= mph
120/7=17.14 mph

Travel_Word_Problems/460778: Bob Dansky and Sandy Spears are at opposite ends of a shopping mall 4780.4 feet apart walking towards each other. If Barb walks
1.5 feet per second and Sandy walks 2.2 feet per second, how long will it be before they meet?
1 solutions

Answer 316106 by rwm(914) on 2011-06-14 07:54:24 (Show Source):

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since they are walking towards each other we can add their speeds together
1.5 +2.2=3.7
they need to go 4780.4 feet
4780.4/3.7 will give us the number of seconds
1292 seconds
21.53 minutes
21 8/15=21min 32 seconds

Travel_Word_Problems/460776: Two trains in New York start at the same station going in the same direction on sets of parallel tracks. The local train stops often and
averages 18.4 miles per hour. The express train stops less frequently and averages 30.2 mph. In how many hrs. will the two trains be 5.9
miles apart?
1 solutions

Answer 316104 by rwm(914) on 2011-06-14 07:48:16 (Show Source):

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Since they are going in the same direction we can find out how fast the one gains on the other by subtracting.
+30.2
-18.4
+11.8 mph
so they'll be 5.9 miles apart in half an hour.

Coordinate-system/460788: write an equation of each line in slope intercept form and standard form if possible. Through (2,3) and prallel to the y-axis
1 solutions

Answer 316103 by rwm(914) on 2011-06-14 07:42:53 (Show Source):

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y=3

Trigonometry-basics/460824: I have an equilateral triangle, with a known length of hypotenusa (25 cms). How do I calculate the length of a side of the triangle? I don't get any further than 625 = c^2-(c/2)^2
I need this to design a quilt - this is an equation I need quite often and I'd rather make my quilt pieces the size I want them rather than buy a pattern and live with whatever the designer wanted.

1 solutions

Answer 316102 by rwm(914) on 2011-06-14 07:40:22 (Show Source):

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It is a 30 60 90 triangle.
hypotenuse is twice the shorter side
12.5=s
The longer side is sqrt(3) * 12.5=21.65

Money_Word_Problems/460838: 4-At an interest rate of 12% how long would it take a sum of money to double?

1 solutions

Answer 316101 by rwm(914) on 2011-06-14 07:28:50 (Show Source):

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Too many questions.
Limit your self to one question per post and 5 per day

Numbers_Word_Problems/460842: what number will result if you add 3 and 8,then multiply the sum by the quotient of 45 and 9,whet is to be anwered first?why?

1 solutions

Answer 316099 by rwm(914) on 2011-06-14 07:26:00 (Show Source):

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(45/9)*(3+8)
You can add first or divide 45 by 9 first.
They are independent.
5*11=55

Linear-equations/460839: how do i find a missing coordinate when the slope is 7 and coordinates are (x,8) and (4,1)
1 solutions

Answer 316097 by rwm(914) on 2011-06-14 06:37:57 (Show Source):

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(8-1)/(x-1)=7
7/(x-1)=7
divide by 7
1/(x-1)=1
multiply by x-1
1=x-1
x=2

Graphs/460825: I'm 46 and "trying" to refresh my algebra. Any help is appreciated.
How do I solve AND graph this?
x/3 < = 5
Thanks

1 solutions

Answer 316096 by rwm(914) on 2011-06-14 06:32:06 (Show Source):

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x/3 < = 5
multiply by 3
you submit too many problems which are similar.
We are here to teach not do your homework for you.
I understand that you are 46. I am 64!

Graphs/460826: I'm 46 and "trying" to refresh my algebra. Any help is appreciated.
How do I solve AND graph?
Solve the conjunction -2 < = a+3 < 8
Thanks

1 solutions

Answer 316095 by rwm(914) on 2011-06-14 06:27:25 (Show Source):

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-2 < = a+3 < 8
subtract 3
-5 < = a < 5
There is something quirky about < and >
You have to leave a space before and after each symbol or the rest disappears.

Linear-equations/460836:
Please its urgent
1 solutions

Answer 316094 by rwm(914) on 2011-06-14 06:21:47 (Show Source):

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All problem are urgent.
Why is yours so important ?

Linear-equations/460837: y=-2x+1

1 solutions

Answer 316093 by rwm(914) on 2011-06-14 06:19:27 (Show Source):

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what is your question?

Travel_Word_Problems/460835: a cyclist's speed is 30km/hr.
how hany km will she go in 20 minutes
1 solutions

Answer 316092 by rwm(914) on 2011-06-14 06:15:44 (Show Source):

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20 minutes is 1/3 hr
30*1/3=10

Inequalities/460827: How would I solve the following????
-6 < = 3+x<4

Thanks

1 solutions

Answer 316091 by rwm(914) on 2011-06-14 06:06:38 (Show Source):

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-6 < = 3+x<4
subtract 3
-9 < = x < 1

Expressions-with-variables/460673: Will you please assist in solving this question.
Solve using the elimination method: 4x- 8y = 16
-2x+5y = 55
1 solutions

Answer 316004 by rwm(914) on 2011-06-13 19:08:31 (Show Source):

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multiply the second by 2
add the new and the first

Miscellaneous_Word_Problems/460684: There are 220 barrels of cement in one shed and 510 barrels in another shed. How many barrels must be transferred from the second to the first shed so that the first shed will contain two-thirds as much as the second shed?
1 solutions

Answer 316000 by rwm(914) on 2011-06-13 18:49:47 (Show Source):

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220+510=730
2/3=(220+x)/(510-x)
x=72

Age_Word_Problems/460688: The ratio of detectives to patrol officers is 2:9 The police force has 187 detectives and patrolemen, how many detectives
1 solutions

Answer 315999 by rwm(914) on 2011-06-13 18:45:12 (Show Source):

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2x+9x=187
11x=187
x=187/11
x=17
2x=34 detectives
9x=153 patrol officers

Problems-with-consecutive-odd-even-integers/460686: i 'AM REALLY HAVING A PROBLEM UNDERSTANDING HOW TO SOLVE A CONSECUTIVE INTEGER PROBLEM. HELP ME PLEASE i HAVE A TEST ON WEDNSEDAY
1 solutions

Answer 315995 by rwm(914) on 2011-06-13 18:39:48 (Show Source):

You can put this solution on YOUR website!
Stop shouting.
Show us a problem that you can't do.

Linear-systems/460641: Can someone help me solve this by elemination? What is the solution?
x + 5y = 24
-x+ 5y = 6
1 solutions

Answer 315961 by rwm(914) on 2011-06-13 16:36:50 (Show Source):

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add them
10y=30
y=3
x+5*3=24
x=9

Travel_Word_Problems/460605: a chemist has one solution that is 20% salt and a second solution that is 45% salt. how many liters of each should be used in order to get 20 L of a solution that is 30% salt?
1 solutions

Answer 315960 by rwm(914) on 2011-06-13 16:34:00 (Show Source):

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.2x+.45y=.3*20
x+y=20
x=12 y=8

Travel_Word_Problems/460609: it takes kevin 3 hours more than john to paint a fence. together they painted for 3 hours, than kevin left and john finished the job in one additional hour. find how long it would take each boy to paint the fence alone?
1 solutions

Answer 315957 by rwm(914) on 2011-06-13 16:28:47 (Show Source):

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k=j+3
x/k+x/j=1
3/k+3/j+1/j=1
j = 6, k = 9, x = 18/5=3.6
john would take 6 hrs alone
kevin would take 9 hours alone
together they would take 3.6 hours.

Equations/460632: an equation for the word problem mike and steve have wallets with 5 and tens in them with a total of 20 bills and if the 20 bills add up to a total of $130..
1 solutions

Answer 315951 by rwm(914) on 2011-06-13 16:15:47 (Show Source):

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5f+10t=130
f+t=20
f=14
t=6

test/460635: Please factor this equation and show how you did it:
-x^4+2x^2+8
1 solutions

Answer 315947 by rwm(914) on 2011-06-13 16:08:55 (Show Source):

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-(x-2) (x+2) (x^2+2)

Quadratic_Equations/460631: Hello everyone,
This is my problem:
Find all numbers for which the rational expression is undefined
m^3-3m/m^2-4
1 solutions

Answer 315943 by rwm(914) on 2011-06-13 16:02:50 (Show Source):

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when m^2-4=0

Graphs/460623: Solve the system of equations by graphing. Then classify the system as consistent or inconsistent and as dependent or independent.
8x-7y=42
7y-8x=-42
what is the solution of the system of equations?
consistent or inconsistent?
dependent or independent?
1 solutions

Answer 315939 by rwm(914) on 2011-06-13 15:50:05 (Show Source):

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they are multiples of each other.
multiply one by -1 and you get the other.

Travel_Word_Problems/460621: the rate of the jet stream is 300 miles per hour. traveling with the jet stream, an airplane can fly 2500 miles in the same amount of time as it takes to fly 1000 miles against the jet stream. What is the airplanes average rate in calm air?
1 solutions

Answer 315937 by rwm(914) on 2011-06-13 15:38:47 (Show Source):

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(a+300)*t=2500
(a-300)*t=1000
a=700
t=2.5

Permutations/460620: How many different hands in one suit are possible?
1 solutions

Answer 315931 by rwm(914) on 2011-06-13 15:29:28 (Show Source):

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how many cards in a hand?

Polynomials-and-rational-expressions/460619: -13x^3+9/x^3-4x
Find the real numbers for the rational expression thats undefined
find the value of the expression when x = -4
x+8/x^2-x+9

1 solutions

Answer 315929 by rwm(914) on 2011-06-13 15:27:17 (Show Source):

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when ^3-4x =0 it is undefined

Average/459146: suppose you have an 88% in the class. the final is worth 15% of your overall grade. what do you need to earn on the final to get a 90 % in the class?
1 solutions

Answer 314896 by rwm(914) on 2011-06-08 21:47:21 (Show Source):

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.85*88+.15x=90

Average/459148: you have an 81% in the class what is the lowest grade you could earn on the final and still keep your 81% in the class?
1 solutions

Answer 314894 by rwm(914) on 2011-06-08 21:44:10 (Show Source):

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Not enough info.
Depends on what value is put on the final and how much the class work is worth.
The final could be worth 50 % or 90%
You have an 81% in the class what is the lowest grade you could earn on the final and still keep your 81% in the class?
The writer says:
well the final is worth 15% of your grade hw is worth 30% quizes are worth 15% and tests 40%
Assuming that you mean that you have 81% average on hw, quizzes and tests.
.30*81+.15*81+.4*81+.15f=81
f=81
To keep 81 you will need at least 81 on the final.

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Recent problems solved by 'rwm'