Tuesday
October 21, 2014

Posts by Don


Total # Posts: 457

maath
there are 3 arrays for 4.how many arrays can be drawn for each prime numbers
April 29, 2012

Physics 30
If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s
April 20, 2012

algebra
if the red river is 500 miles longer than the blue river. if the sum of their lengths is 5550 miles what is the length of each river
April 16, 2012

algebra
Can someone help me figure this out please? when you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? thank you anyone
March 18, 2012

algebra
I need help. Can someone help me please. Explain how you can determine from the graph of a system of two linear equations in two variables whether it is an inconsistent system of equations. Thank you
March 18, 2012

Physics
(.50 kg )(35.7m/s^2) = ? kilograms meters per second squared
March 17, 2012

calc
by applying rolle's theorem, check whether it is possible that the function f(x) = x^5 + x -17 has two real roots. your reason is that if f(x) has two real roots then by rolle's theorem, f'(x) must be equal to what at certain value of x between these two roots, but...
March 16, 2012

chemistry
Carbon monoxide gas and hydrogen gas are mixed in a two liter flask. The reaction produces methanol gas as the only product. At equilibrium the Keq is 1.1 x 10-5. The flask initially held 6 grams of hydrogen and the equilibrium concentration of hydrogen is 0.1 M. How many ...
March 12, 2012

Discete Math
Show that there must be at least 90 ways to choose six integers from 1 to 15 so that all choices have the same sum.
February 27, 2012

Physics 30
First A(B-A) then subtract B again from that answer. I see A as (0,3.5) and B as (-4.2,0) I hope thats the right way algebraically.
February 21, 2012

Physics 30
Hi Bob ... the first post is actually the question .. subtract B from A(B-A)
February 21, 2012

Physics 30
Vectors A) 3.5 cm North B) 4.2 cm West Algebraically subtract B from A(B-A) Whaaaa? Please help
February 21, 2012

math
a sales representative earned four times as much in the fourth week of jan than any other week in jan what is the income for the fourth week
February 19, 2012

math
If a tree is 10 feet tall after two years and 25 feet tall after 5 years, find the rate of change of growth of the tree if y is the height in feet and x is the number of years. Be sure to give correct units.
February 12, 2012

chemistry
(100g)(.473J/g°C)(x-62°C) =-(500g)(4.184J/g°C)(x-22°C) Q = mass•specific heat•change in temperature Can someone show me how to solve this so i can teach myself before my test on Monday ..thanks for your time
February 3, 2012

Math
Fred runs a lap every 2 minutes and Mark runs a lap every 2.5 minutes. They start together. How long will it be before they are next to each other again?
January 19, 2012

Trig
(x+3)^2/4^2 + (y-2)^2/5^2 The location of the Foci are at: a.(-3,-1) and (-3,-5) b. (-3,2) and (-3,5) c. (-3,-3) and (-3,7) d. (-3,1) and (-3,-5) I get (-3,2) and (-3,5) Am I correct?
January 14, 2012

Trig
The question is: Set up a 2 column proof to show that each of the equations is an identity. Transform the left side to become the right side. a. (tan + cot)^2 = sec^2 + csc^2 I'm having trouble with this. b. (cos + sin)/cos + (cos - sin)/sin = csc sec I'm having ...
January 8, 2012

Trig
Thanks Damon.
January 8, 2012

Trig
The actual question goes : make the left the same as the right: left side: tan/sec - 1 = right side sin/1-cos
January 8, 2012

Trig
(sin/cos)/ ( 1/cos - 1) = I'm stumped
January 8, 2012

Trig
The question says: Set up a 2 column proof to show that each of the following equations is an identity. Transform the left side to become the right side. (tan + cot)^2 = sec^2 + csc^2
January 8, 2012

Trig
Hi Damon .. apparently they want the right side to stay "as is" and for the left side to transform into exactly what the right side says .... sorry
January 8, 2012

Trig
Proving Identities: 2 columns (tan + cot)^2 = sec^2 + csc^2 I'm having trouble breaking down the left side to = the right side.. Any help please
January 8, 2012

Trig
ARGHHHHH now that really was a brain fart on my part ... Thanks a lot Reiny for the help Don
January 4, 2012

Trig
(x+0)^2 + (y+4)^2 = 17 the center would be (0,4) I can't see it any other way ...arghhhh
January 4, 2012

Trig
I'm not sure what your looking for Reiny. It looks like the center of the circle is still (0,4) what am I doing wrong?
January 4, 2012

Trig
the center of a circle x^2 + y^2 + 8y =1 is a. (0,-2) b. (0,4) c. (0,1) d. (0,-4) I believe the answer is (0,4) Am I correct ?
January 4, 2012

Trig
The center of the circle (x+2)^2 + (y-3)^2 =1 is a. (2,3) b. (-2,3) c. (2,-3) d. (-2,-3) I believe b. is the answer, is that correct?
January 4, 2012

Trig
The radius of: (x+2)^2 + (y-3)^2 =9 is 3 is this correct?
January 4, 2012

Trig
If the center of a circle is at (2,2) with a radius of 4 the equation of the graph would be : a) (x-2)^2 + (y-2)^2 = 16 b) (x+2)^2 + (y+2)^2 = 16 I think it would be b is that correct?
January 4, 2012

Trig
Oops, brain fart ... answer is -4/5 i guess it was a long day ... thanks anyway .. Don
January 2, 2012

Trig
Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??
January 2, 2012

Trig
Half angle identities Find exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than 360 deg. I get a) - rt 3/5 b) rt24/5 and c) does not work out at all .... Help please.. book says for answers a)-rt15/5 b) rt10/5 c) -rt6/3 How do you...
January 1, 2012

Trig
Found my mistake .... All is good now Thanks for the help earlier Damon Don
December 27, 2011

Trig
If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?
December 27, 2011

Trig
The answer is 1/8 Is that correct Damon ?
December 27, 2011

Trig
If tanx = 2/3 tany = 1/2 then tan(x-y) = ?? a.7/4 b.7/6 c.1/8 d.8/6 which answer is correct ??
December 27, 2011

Trig
= sin (a+b) = sin 70 Is that right Damon ?
December 27, 2011

Trig
sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??
December 27, 2011

Trig
cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which answer is correct ?
December 27, 2011

Trig
Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?
December 22, 2011

Trig
Rewrite tan 88 deg in terms of its cofunction How does that end up????
December 22, 2011

Trig
cot (tan + cot) = ?
December 20, 2011

Trig
( sec -1 )(sec +1 ) = ?
December 20, 2011

Trig
sin/tan = ?
December 20, 2011

Trig - Thanks Damon and Lindsey
Thanks a bunch
December 20, 2011

Trig
If sin = 2/3 and is a second quadrant angle, determine the exact value of sec^2 could be a. 5/9 b. root5/3 c. 9/4 d. 9/5 Please help.......
December 20, 2011

Trig
The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please
December 17, 2011

Trig
Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one
December 17, 2011

Trig
Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??
December 17, 2011

Trig - Thanks Damon
Thanks for the help Damon. Much appreciated. Don
December 17, 2011

Trig
Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities
December 17, 2011

Trig
Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities
December 17, 2011

Math C30
Eight Fundamental Identities Sec thada - Cos thada- on one side tan thada sin thada- on the other side How do you do this ???
December 17, 2011

Trig
Please disregard last question .... wrote it down wrong .. Thanks
December 17, 2011

Trig
Eight Fundamental Identities Sec thada - Cos thada How do I do this?
December 17, 2011

Math C30
The first step in solving the equation: 4 sinx - sinx = 0 is what?
November 23, 2011

Physics
If a force of 20N stretches a spring 15 cm, by what amount will the spring stretch is if a force of 80 N is applied?
November 17, 2011

Math C30
What's next? Solve: cosx(tanx + sqroot3) - sqroot3/2(tanx-sqroot3) Provide exact answers .. help
November 7, 2011

Math C30
In steps how do you go from: y = 25cos pi/200x + 30 to get the answer 44.695
November 7, 2011

trig
write equations expressing: 19cos(theta-50degrees) as a sum of sine and cosine.
November 6, 2011

Math C30 ( trig )
A roof in the shape of an upside down cosine wave is to be buile to cover an arena. The arena is 24m wide, the height of the roof at either side wall is 5m, and the maximum height of the roof is 9m. A) write a function that gives the height of the roof in terms of your ...
November 6, 2011

Math C30 ( trig )
Solve : cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 Give exact answers and formula for the general solution as well as the specific solutions.. Help
November 6, 2011

MATH C30
A roof in the shape of an upside down cosine wave is to be built to cover an arena. The arena is 24 m wide, the height of the roof at either side wall is 5 m, and the max height of the roof is 9m . write the function that gives the height of the roof in terms of the distance ...
November 6, 2011

MATH C30
How to find the amplitude, period, phase shift, vertical shift, and the equation of the primary function of the function: y = -cot(1/3x - pi/6) how to find where the period begins and ends
November 6, 2011

MATH C30
Solve cosxtanx + sqroot3cosx - sqroot3/2tanx - 3/2 = 0 interval 0 to 2 pi exact answers and formula for the general solution as well as the specific solutions. Sorry Steve, missed it last night.
November 6, 2011

math c30
solve cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 exact value answers and formula for the general solution and specific solutions.
November 6, 2011

math c30
what is the domain and range of the function y= -2cos 1/2 ( x + pi/4 ) -2
November 5, 2011

math c30
Solve cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 exact answers and formula for general solution
November 5, 2011

Trig
Solve 2cosxsinx + sinx = 0 using unit circle.
November 2, 2011

Trig
Solve 2cos sq x = 1 using the unit circle.
November 2, 2011

Math C30
Last Question disregard .. ooops Solving Equations Containing Circular Functions .. Solve 2cos^2x=1
November 2, 2011

Math C30
Solving Equations Containing Circular Functions ... Solve 2cos^2=1
November 2, 2011

Math C30
Equations containing circular functions and unit circle... solve 2cosx sinx + sinx = 0
November 1, 2011

Math C30
using unit circle solve: 2cos sq x =1
November 1, 2011

Mathj C30
Solving Equations Containing Circular Functions : Solve 2cosx sinx + sinx = 0 when x is between 0 and 2pi
November 1, 2011

Math C30
Solving Equations Containing Circular Functions : Solve 2cos sq x =1
November 1, 2011

physics
A 130g ball moving at 0.35m/s in the x-direction is subject to a 0.25N force in the - y-direction for 1.0s. Find the magnitude of the ball's momentum change.
November 1, 2011

Physis Home work
Two 0.85Mtrs -long pendulums hang side by side. The masses of the pendulum bobs are 50g and 70g . The lighter bob is pulled aside until its string is horizontal and is then released from rest. It swings down and collides elastically with the other bob at the bottom of its arc...
November 1, 2011

Physis Home work
Two 0.85Mtrs -long pendulums hang side by side. The masses of the pendulum bobs are 50g and 70g . The lighter bob is pulled aside until its string is horizontal and is then released from rest. It swings down and collides elastically with the other bob at the bottom of its arc...
November 1, 2011

math c30
-pi/4 plus 15pi/4 divided by 2=7pi/4 how is the math done regarding the fractions (dividing and multiplying)
October 22, 2011

Math c30
Determine the period length of y=3tan 2x I had the answer to be pi , but the correct one is pi/2 How do you get that answer??
October 22, 2011

math c30 trig
Determine the period length of y= 2/3 sin (3x/2 ) I had 3pi/2 but the correct answer is 4pi/3 how do you get that???
October 22, 2011

math
thanks. this is the problem and answer from a math book. the closets i came is 103. i will ask the teacher how to get it.
October 19, 2011

math
the folowing equation 9+8x7-6x5+4x3+2=105 How do u get this?
October 19, 2011

math 10
(2squared) cubed
October 18, 2011

trig
find the exact values of the six trig functions of theta equals six pi divided by 8
October 17, 2011

Statistics
A set of 50 data values has a mean of 35 and a variance of 25. I. Find the standard score (z) for a data value = 26. II. Find the probability of a data value > 26.
October 17, 2011

Physic
A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on the block ...
September 28, 2011

math
count the zeros in both problems.
September 12, 2011

Ocean
Locations of hot spots remain fixed for a long time. As plates move across such hot spots, they form chains of volcanoes. The Hawaiian Islands are an example of such an island chain formed over a hot spot. Volcanoes on the Island of Hawaii are still active. Moving northwest, ...
September 12, 2011

chemistry
K = (Product/Reactant) 1.6*10^-5 = (x)^2 * 0 )/(.480)^2 x = 0.00191833261 Someone check this
September 12, 2011

Programming
Programming language is C
June 29, 2011

Programming
2. Then it should prompt the user for the input file name of the file containing the data to sort. 3. If the program can't open the file or if no file name is entered (^d or ^z is entered for EOF), it should print an error message and exit. 4. The file will contain numbers...
June 29, 2011

poetry
I need help scanning "Combing"
June 28, 2011

math
marla earned $400.00 interest over 2 years on a $4000.00 investment. jovita earned $960.00 interest over 4 yars on her $ 6000.00 investment. Who had the higher rate of interest?
June 15, 2011

chemistry
in a compound of nitrogen and oxygen, 14.0 grams of nitrogen combines with 32.0 grams of oxygen. How much oxygen is required to combine with a sample of 10.5 grams of nitrogen in producing same compound? How do you do the math?
June 6, 2011

college math 201
i have 50 feet of fence and the house will be the fourth side. i want a rectangular fence as big as possible. what re the dimensions?
May 8, 2011

math
how is the speed of a falling object determined.
March 28, 2011

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