08/10/14

solve the system of equations
x - y + z = -7 x + y + z =1 x + y - z = 9
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08/09/14

Extensive knowledge of Idioms
what do these idioms mean: to look a gift horse in the mouth   a house of cards    take with a grain of salt   a flash in a pan
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08/09/14

Solving two equations
 and need to find where they intersect. y = x - 1 and the parabola y^2 = 2x + 6 I know I set them equal to each other.  But every time I solve it I get one point wrong. One time I'll find... more
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08/06/14

calculus proof
If f(x)=Σx4n/(4n)! ....prove that the 4th derivative equals f (x)
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08/05/14

Systems of Equations
Find values of A and B so that the graph of the given equation will contain the points: Ax+By=3; (8,3) and (13,7)
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08/02/14

Matrix 2x1 transpose - inverse
If A and B are any matrices of order 2×1, why does the product ABt have no inverse?
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08/01/14

Choosethe best description of the system
4x-3y=10 -20x+15y=50   select all that apply: inconsistent independent dependent consistent
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08/01/14

Probability question
Hi, I have a question on probability that I don't know how to approach:   Box A contains 10 cards numbered 1 through 10, and box B contains 5 cards numbered 1 through 5. A box is selected at... more
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07/31/14

point P on a circle
How do I calculate point P on a circle when I have the following information: Radius=7 Arc Length=3 Angle in degrees=0.42857 Angle in rounded degrees 25
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07/31/14

use sigma notation to write the sum 9/(i+1)+9/(i+2)+9/(i+3)+....+9/(i+14)
use sigma notation to write the sum 9/(i+1)+9/(i+2)+9/(i+3)+....+9/(i+14)
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07/30/14

Findthesolution tothe system of linear equations usingelimination for -x-2y=2 and 4x-2y=8
Enter the system's solution as an ordered pair, including the comma. if the system has no solution enter none. If it has infinitely many solutions say so
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Expert Answers •1

07/30/14

A new yarn shop wants to apportion their investment money ($90,000) in the ratio of 7:8:10. How much money does each category get?
please give detailed explanation
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07/30/14

Distance, Rate and Time Question
Tom Quig traveled 250 miles east of St. Louis. For mot of the trip, he averaged 70 mph but for one period of time, he was slowed to 10 mph due to a major accident. If the total time of travel was 7... more
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07/30/14

I'm working on a math problem 6(5-9)/(4-2)^2 and the answer is-7 but working it out, I get -6. Can you help?
Would you help me solve this math problem: 6(5-9)/(4-2)^2. The answer is suppose to be a -7 but after working the problem out I am still getting -6.
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Expert Answers •1

07/26/14

What sine function represents an amplitude of 1, a period of 2p, a horizontal shift of p, and a vertical shift of -4?
trig need help with me. please!! 
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Expert Answers •2

07/24/14

How to prove this identity
tan3x - tan2x- tanx = tan3xtan2xtanx
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07/23/14

Calculus question
Find each definite integral    top:3 bottom:0 (square root) y+1dy     top:3 bottom:2 1/e^x Dx
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07/23/14

algebra word problem
During a research experiment, it was found that the number of bacteria in a culture grew at a rate proportional to its size. At 7:00am there were 6,000 bacteria present in the culture. At noon, the... more
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07/16/14

Solve by completing the square; round to the nearest hundredth, if necessary
3x^2+15x=108 I've been on this problem for days now for my summer work and I've googled how to solve it and I still don't understand help would be very appreciated
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07/15/14

if a_k= 5 + 5^2 + 5^3 + 5^4 + ... +5^k
If a_k= 5 + 5^2 + 5^3 + 5^4 + ... + 5^k , for what value of k will a_k be divisible by 10?
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07/09/14

5x -4y=-9-3x+4y=15
Algebra problems
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07/09/14

Find value
sin(x+y)/sin(x-y)=(a+b)/(a-b) then tanx/tany=?
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Expert Answers •2

07/07/14

If 3x^2 – 2x + 7 = 0, then (x – 1/3 )^2= ???? Having trouble with this one! Help!
I believe this question uses the quadratic formula, but I can't seem to find the right answer. If someone could please explain this to me, I would greatly appreciate it.    If 3x2 - 2x + 7 = 0... more
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06/30/14

factorize please
-x3+4x2-23x+20=0
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06/23/14

0= sin (pi)x + cos (pi)x
Solve 0= sin (pi)x + cos(pi)x for the interval (-1,3)
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