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Recent problems solved by 'umnikmo'

umnikmo answered: 75 problems
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logarithm/609812: √2:(9)=3
It asks the Equation in logarithmic form is:
I'm not sure how to answer this. i dont understand logarithm form
1 solutions

Answer 384006 by umnikmo(75) on 2012-05-11 09:32:01 (Show Source):

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Logarithm with base 3 of 9 equals 2

Quadratic_Equations/609876: how do you find the roots of 9x^2-650=0
1 solutions

Answer 384003 by umnikmo(75) on 2012-05-11 09:28:30 (Show Source):

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9x^2=650
x^2=650/9
x1=sqrt(650/9)=8.498366
x2=-sqrt(650/9)=-8.498366

absolute-value/609894: 5(7−2)5 =
1 solutions

Answer 384002 by umnikmo(75) on 2012-05-11 09:26:24 (Show Source):

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=5*5*5=125

Rectangles/546727: A rectangle has a perimeter of 34ft. and an area of 60 sq. ft. Find its dimensions.
1 solutions

Answer 356083 by umnikmo(75) on 2011-12-13 16:01:47 (Show Source):

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2(x+y)=34
x*y=60
x=60/y
60/y+y=17
y^2-17y+60=0
y=5
x=60/5=12

Surface-area/546733: Area = 18 in squared
height = 12 in
base =

1 solutions

Answer 356082 by umnikmo(75) on 2011-12-13 15:59:29 (Show Source):

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1.5

Square-cubic-other-roots/546732: square root of X plus 4 is equal to 12
1 solutions

Answer 356081 by umnikmo(75) on 2011-12-13 15:59:01 (Show Source):

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64

Pythagorean-theorem/544191: a=3.c=5
1 solutions

Answer 355040 by umnikmo(75) on 2011-12-08 16:29:52 (Show Source):

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b=4

Polynomials-and-rational-expressions/544058: (5z+2)(z^2+3z+2)
Please help, I cannot seem to come up with the correct answer.
1 solutions

Answer 355010 by umnikmo(75) on 2011-12-08 13:22:09 (Show Source):

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=5z^3+17z^2+16z+4

Quadratic_Equations/543969: r^2=9
1 solutions

Answer 354989 by umnikmo(75) on 2011-12-08 10:21:37 (Show Source):

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r=3 or -3

Expressions-with-variables/543974: I need help with solving for X.
6-3x=5x-10x+18
1 solutions

Answer 354988 by umnikmo(75) on 2011-12-08 10:21:07 (Show Source):

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6-3x=-5x+18
2x=12
x=6

Linear-systems/543980: I have to do this with the substitution method: Help me please
3x = 4y
x = (2y+1)/3

I know the answer is x=2/3 and y = 1/2 but I don't know the method
Thank you
1 solutions

Answer 354987 by umnikmo(75) on 2011-12-08 10:19:51 (Show Source):

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from the first we can find x in terms of y: x=4y/3, now we substitute this into second equation, we get:
4y/3=(2y+1)/3
we can multiply both sides by 3:
4y=2y+1
2y=1
y=1/2.
now, as x=4y/3=4*(1/2)/3=2/3
same as your answers.

Inequalities/543957: Helping kid with homework, been too long, Please help.
solve in interval notation
|6x – 1| ≤ 7

1 solutions

Answer 354986 by umnikmo(75) on 2011-12-08 09:47:31 (Show Source):

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fist we assume 6x-1>0 so x>1/6
6x-1<=7
6x<=8
x<=4/3
so x E (1/6;4/3]
now we assume 6x-1<=0 so x<=1/6
1-6x<=7
x>=-1
so x E [-1;1/6]
Ans: x E [-1;4/3]

Inequalities/543947: I am trying to help my daughter with her homework and it has been quite a while for me. Thanks for your help.
Solve with answer in interval notation
3x + 5(x - 4) + 7 < 5(x -1) + 2x

1 solutions

Answer 354985 by umnikmo(75) on 2011-12-08 09:39:39 (Show Source):

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3x+5x-20+7<5x-5+2x
8x-13<7x-5
x<8

Inequalities/543953: Please help, trying to help daughter with homework and it has been so long.
Solve in interval notation
X2 + 5x – 14 > 0

1 solutions

Answer 354984 by umnikmo(75) on 2011-12-08 09:33:53 (Show Source):

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(x+7)(x-2)>0
x E (- infinity; -7)U(2;+infinity)

test/543942: (3/8)³
1 solutions

Answer 354983 by umnikmo(75) on 2011-12-08 09:31:07 (Show Source):

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=3^3/(8^3)=27/512

Exponents-negative-and-fractional/543943: how to get the answer for 6-(-8)
1 solutions

Answer 354982 by umnikmo(75) on 2011-12-08 09:30:17 (Show Source):

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6-(-8)=6+8=14

Functions/543416: what is 4,420 minus 8%?
1 solutions

Answer 354830 by umnikmo(75) on 2011-12-07 15:10:09 (Show Source):

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4420-.08*4420=4066.4

Evaluation_Word_Problems/543383: translate to an inequality
My Salary next year will be at least $41,000
The price of a baseball glove is no more than $41.99
1 solutions

Answer 354824 by umnikmo(75) on 2011-12-07 14:37:21 (Show Source):

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Salary%3E=41000

Word_Problems_With_Coins/543387: A coin collector has 61 dimes and nickels with a total face value of $5.25. How many of each coin does she have?
1 solutions

Answer 354822 by umnikmo(75) on 2011-12-07 14:34:27 (Show Source):

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X-dimes
Y-Nickels
X+Y=61
10X+5Y=525
X=61-Y
10(61-Y)+5Y=525
610-10Y+5Y=525
85=5Y
Y=17
X=61-17=44.
CHECK:
10*44+5*17=525

test/543391: 3a+3b+b+b
1 solutions

Answer 354821 by umnikmo(75) on 2011-12-07 14:30:06 (Show Source):

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3a+5b

Linear-equations/543364: Determine whether the ordered pair is a solution of the given linear equation.
2x + 5y = -8; (-2,-2)
1 solutions

Answer 354814 by umnikmo(75) on 2011-12-07 13:49:59 (Show Source):

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lets substitute the given pair into the equation:
2*(-2)+5*(-2)=-4-10=-14, which is not equal to -8, so the pair is not a solution.

Number-Line/543374: -2>x≥-5
1 solutions

Answer 354812 by umnikmo(75) on 2011-12-07 13:47:52 (Show Source):

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if you want somebody do the work for you, at least provide enough details.

Miscellaneous_Word_Problems/543298: To obtain the height of a tree, you measure the tree's shadow and find that it is 8 meters long. You also measure the shadow of a 2 meters lamppost and find that it is 75cm long. Find the height of the tree.
1 solutions

Answer 354809 by umnikmo(75) on 2011-12-07 13:00:17 (Show Source):

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2/x=.75/8
from here x= 21.33m

Polynomials-and-rational-expressions/543347: Factor the follwing polynomials.
1) 14x^2y + 4xy^2 + 2xy
i think it is 2xy(7x+2y)
1 solutions

Answer 354808 by umnikmo(75) on 2011-12-07 12:57:18 (Show Source):

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2xy(7x+2y)+1

Money_Word_Problems/543246: What is the commision rate of 2,000 dollars and 7.5%
1 solutions

Answer 354804 by umnikmo(75) on 2011-12-07 10:50:04 (Show Source):

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2000*.075=150

test/543256:
1 solutions

Answer 354802 by umnikmo(75) on 2011-12-07 10:48:46 (Show Source):

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test/543289: Solve for x: 2x+3y=9xy
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Answer 354801 by umnikmo(75) on 2011-12-07 10:47:11 (Show Source):

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2x-9xy=-3y
x(2-9y)=-3y
x=3y/(9y-2)

Probability-and-statistics/543294: Is -1.4 a possible answer to a probability problem?
1 solutions

Answer 354799 by umnikmo(75) on 2011-12-07 10:44:30 (Show Source):

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if you are looking for a probability of something, you are looking for a number between 0 and 1.

Evaluation_Word_Problems/543302: Joe's electric made 16 customer calls last week and 21 calls this week. how many calls must be made next in order to maintain anaverage of at least 19 calls per week for the three week period.
1 solutions

Answer 354798 by umnikmo(75) on 2011-12-07 10:42:48 (Show Source):

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Avr = 19 = (16+21+X)/3
from there :
3*19=16+21+X
X=20

Linear-equations/522815: how to graph x+y=3
1 solutions

Answer 347012 by umnikmo(75) on 2011-10-28 14:08:33 (Show Source):

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set y=3-x
pick two points x=0 => y=3 (0,3) and y=0 => x=3 (3,0)
draw a straight line thru these two points, you got your graph

Linear-equations/522811: can any one help me on ways to solve algebra equations ? like :
combining like terms
linear word problems
solving equations : one- two - multi-step equations ?
id truly appreciate if you taught me any tricks to solve them too
1 solutions

Answer 347010 by umnikmo(75) on 2011-10-28 13:53:36 (Show Source):

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