Friday
December 2, 2016

# Posts by Rachal

Total # Posts: 97

Math 10
Cashew nuts are sold at 15 per kg. Walnuts are sold at 12 per kg. What quantities of each nut would a store owner put into a 100-kg barrel so that it could be sold for 13.20 per kg?
June 1, 2016

Algebra
Thanks!
June 8, 2011

Algebra
The function g is defined below. g(x)=((x)^(2)-9x+14)/((x)^2-11x+24) Find all values of x that are NOT in the domain of g. If there is more than one value, separate them with commas.
June 8, 2011

Algebra
Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4L, the pressure is 165 kPa(kilopascals). What is the volume when the pressure is 60 kPa?
June 7, 2011

Physics
Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4L , the pressure is 165kPa (kilopascals). What is the volume when the pressure is 60kPa?
May 23, 2011

Algebra
Miguel is choosing between two exercise routines. In Routine #1, he does only running, burning 15 calories per minute. In Routine #2, he burns 12 calories walking. He then runs at a rate that burns 12 calories per minute. For what amounts of time spent running will Routine #1 ...
May 18, 2011

Algebra
Miguel is choosing between two exercise routines. In Routine #1, he does only running, burning 15 calories per minute. In Routine #2, he burns 12 calories walking. He then runs at a rate that burns 12 calories per minute. For what amounts of time spent running will Routine #1 ...
May 18, 2011

Algebra
Austin is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$104.00 and allows unlimited mileage. Company B has an initial fee of \$65.00 and charges an additional \$.60 for every mile driven. For...
May 18, 2011

Algebra restate problem
The function h is is defined below h(x)=(x+6)/(x^2+9x+8) Find all values of x that are NOT in the domain of h. If there is more than one value, separate them with commas.
May 18, 2011

Algebra
The function h is is defined below. h(x)=48x^2+ 12x - 16 Find all values of x that are NOT in the domain of h. If there is more than one value, separate them with commas. I'm lost.
May 18, 2011

Algebra
The polynomial function is defined by f(x)=4x^4+2x^3-8x^-5x+2. Use a calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth.
May 18, 2011

Algebra
Find a polynomial f(x) of degree 3 with real coefficients and the following zeros. -1,3+i f(x)=
May 17, 2011

Trig
A ramp 38' long rises to a platform. The bottom of the platform is 20' from the foot of the ramp. Find x , the angle of elevation of the ramp. Round your answer to the nearest hundredth of a degree. After this question I'm done with TRIG!!! Thanks
May 15, 2011

Trig
Find all solutions of the equation in the interval [0,2pi). sqrt(3)cottheta-1= 0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
May 15, 2011

Trig
Find all solutions of the equation in the interval [0,2pi) . cos(theta)=0.7125 If there is more than one solution, separate them with commas. Do not round any intermediate computations, and round your answer(s) to the nearest hundredth. Can someone help me with this? Thanks
May 15, 2011

Trig
The polynomial function f(x) is defined by f(x)=-4x^4+9x^3+2x^2-7x-2. Use a graphing calculator to find all the points where there is a local minimum. Round to the nearest hundredth.
May 15, 2011

Trig
thanks!
May 14, 2011

Trig
I need help, I don't remember what to do. Find all solutions of the equation in the interval [0,2pi]. (2cosè+sqrt3)(cscè+1)=0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
May 14, 2011

Find the unit vector in the direction of <-1,-2>. Do not approximate any numbers in your answer. I get (-1/sqrt10) and (-3/sqrt10)
May 14, 2011

I now think its 36 degrees
May 14, 2011

Find the reference angle for -144 degrees. I'm coming up with 504 degrees, but I think I'm missing a step.
May 14, 2011

Trig
Thanks!!!!
May 13, 2011

Trig
I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-sqrt(4-x^(2)) 2. 34x^(2)+12y^(2)=18
May 13, 2011

Trig
thats supposed to be a neg in front of the 4 in problem 1.
May 13, 2011

Trig
I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-ã(4-x^(2)) 2. 34x^(2)+12y^(2)=18
May 13, 2011

Trig
Thank you I see where I got stuck
May 12, 2011

Trig
How can I find the exact value of Sin 480 degrees? Thanks
May 12, 2011

Algebra
Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 25 liters per minute. There are 700 liters in the pond to start. Let W represent the amount of water in the pond (in liters), and let T represent the number of minutes that ...
May 12, 2011

Algebra- I get 1 out of two parts
Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 25 liters per minute. There are 700 liters in the pond to start. Let W represent the amount of water in the pond (in liters), and let T represent the number of minutes that ...
May 11, 2011

Use a cofunction to write an expression equal to csc(4ð/11). Is the answer csc(4ð/11)= 1/sin(4ð/11)
May 11, 2011

Trig
Use a cofunction to write an expression equal to csc(4ð/11). I need help solving this problem. Thank You
May 11, 2011

math- check me
I got: 2873 = 2600 e^(2.5r) ln(2873 / 2600) = 2.5r [ln(2873 / 2600)] / 2.5 = r r=0.0399381 it says to round the percentage to the nearest hundreth. any help
February 21, 2011

Math
Suppose that the number of bacteria in a certain population increases according to an exponential growth model. A sample of 2600 bacteria selected from this population reached the size of 2873 bacteria in two and a half hours. Find the continuous growth rate per hour. Write ...
February 21, 2011

Math
I got 2/21 thanks for the input
February 21, 2011

Math
A department store is holding a drawing to give free shopping sprees to two lucky customers. There are 15 customers who have entered the drawing: 4 live in the town of Gaston, 6 live in Pike, and 5 live in Wells. In the drawing, the first customer will be selected at random, ...
February 21, 2011

Math
Solve for x. 14^(-3x)=11^(-x-3) Write the exact answer using base-10 logarithms How do I start this problem? Thank You
February 16, 2011

Math
Solve for x. log3(x+7)=2-log3(x-1) Write the exact answer using base-10 logarithms.
February 15, 2011

Math
I figured it out. Equation: time + time = 60 hrs. --- x/30 + (1425-x)/15 = 60 --- x + 2*1425- 2x = 30*60 --- -x = -1050 x = 1050mL --- x/30 = 35 hrs (time of 1st storm) ----- (1425-x)/15 = 375/15 = 25 hr (time of 2nd storm)
February 15, 2011

Math
Can anybody help me start this? Thanks
February 15, 2011

math- check me
f(x)=3 -4|-11+x| -4|-11+3| -4|8| Do I divide or multiply?
February 15, 2011

math- check me
Solve the inequality for x. 16 <= 4x+4 I get x>=3 Is that right?
February 15, 2011

Math
Thank You
February 15, 2011

Math
Evaluate the following: |6-10|-|5| I get: |-4|-|5| 4-5 Is the answer -1
February 15, 2011

intermediate algebra
Write the equation of the line: The points are at (-8,-6) and (0,0). The line passing through these two points has a y-intercept of 0 since it passes through the origin. The slope is -6-0/-8-0=3/4 How would I finish this? Thanks
February 15, 2011

intermediate algebra-can somebody check my answer
Evaluate the expression m^2+93+7 when m=-4 -4^2+9*(-4)+7 does it = -13
February 15, 2011

intermediate algebra
Write the equation of the graph. Points are (-8,-6) and (0,0). I think you start at rise over run. But I'm confused thanks
February 15, 2011

Statistics- I'm stuck and its due tonight
In a particular hospital, 6 newborn babies were delivered yesterday. Here are their weights (in ounces): 112, 96, 109, 126, 99, 106 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at least two ...
February 13, 2011

Math
Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and mathematics. I get: ...
February 12, 2011

Statistics - can someone check me
Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and mathematics. P(geo ...
February 12, 2011

Math
You can answer any 8 questions from the 12 questions on an exam. In how many different ways can you choose the 8 questions, assuming that the order in which you choose the questions is irrelevant?
February 10, 2011

Math
I get this but i can't remember what else I do The "AND" are is shared. This is the key. Abandoning the lengthy names: A + S = 0.34 ==> S = 0.34 - A A + B = 0.30 ==> B = 0.30 - A S + B - A = 0.35
February 10, 2011

Math
Suppose that 34% of the people who inquire about investments at a certain brokerage firm end up investing in stocks, 30% end up investing in bonds, and 35% end up investing in stocks or bonds (or both). What is the probability that a person who inquires about investments at ...
February 10, 2011

Statistics-desperate
Its impossible I have alrady tried and it inserts funky symbols
February 9, 2011

Statistics-desperate
I don't know how to post some of the question is there a way I can upload it?
February 9, 2011

beginning algebra
The length of a rectangle is 1ft more than twice its width, and the area of the rectangle is 28ft^2 . Find the dimensions of the rectangle. l= w=
February 9, 2011

Rewrite the expression without using a negative exponent. 4z^-4 Simplify your answer as much as possible. is this right? (1/4z^4)
February 9, 2011

E=IR E=15*8 E=120V -------------- I=E/R I=120/4 I=30 amperes
February 9, 2011

Physics
In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?
February 9, 2011

Math
I get add -2,82,87,-1,-51,-2,53,87,-20,32,35=300 300/49=6.12244 Round two decimals = .061244 or 61.22? I don't know which way I should go.
February 8, 2011

Math
The following is a list of 11 measurements: -2,82,87,-1,-51,-2,53,87,-20,32,35 Suppose that these 11 measurements are respectively labeled. x1,x2¡¦¡¦¡¦¡¦¡¦x11.(Thus,-2 is labeled x1,82 is labeled x2 and so on.) ...
February 8, 2011

beginning algebra
Well this is a question within the subject I posted. Sorry for not labeling it right
February 8, 2011

beginning algebra
In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?
February 8, 2011

beginning algebra
Factor: -8w+uw+vu-8v
February 8, 2011

[(x^2-1)/(x-3)] / [(x^2-x-2)/(3x-9)] I get (3x-3/x-2)
February 8, 2011

can anyone clarify
if the answer should be m<=80 I don't have an equal answer option. Thanks
February 5, 2011

Charlie is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$127 and allows unlimited mileage. Company B has an initial fee of \$55.00 and charges an additional \$0.90 for every mile driven. For ...
February 5, 2011

a=127 b=55+.9m 127=55+.9m 72=.9m m=80
February 5, 2011

Math
Charlie is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$127 and allows unlimited mileage. Company B has an initial fee of \$55.00 and charges an additional \$0.90 for every mile driven. For ...
February 5, 2011

Algebra
A 3 inch thick slice is cut off the top of a cube, resulting in a rectangular box that has volume 128in^3 .Round your answer to two decimal places
February 4, 2011

Algebra
Below is the graph of a polynomial function f with real coefficients. Use the graph to answer the following questions about f. All local extrema of f are shown in the graph. I really need help with this one but I can't post the graph.
February 4, 2011

Algebra
I don't even know where to start, teacher gave us this with no direction. Suppose the polynomial R(x)=a9x^9+a8x^8+...+a,x+a0 has real coefficients with a9 cannot equal 0. Suppose also that R(x)has the following zeros: 5, 6, 5+5i. Using this information, answer the ...
February 4, 2011

Algebra
Thanks
February 3, 2011

Algebra
The number of bacteria in a certain population increases according to an exponential growth model, with a growth rate of 11% per hour. An initial sample is obtained from this population, and after four hours, the sample has grown to 4130 bacteria. Find the number of bacteria ...
February 3, 2011

Got it thanks
February 3, 2011

Choose the end behavior of the graph of each polynomial function. A f(x)= -5x^3-4x^2+8x+5 B f(x)= -4x^6+6x^4-6x^3-2x^2 C f(x)= 2x(x-1)^2(x+3) A= falls to the left and rises to the right B= Falls to the left and right C=Rises to the right and left.
February 3, 2011

Algebra
Find all complex solutions of 4x^2+5x+2=0.
February 3, 2011

Algebra-I'm still stuck
I want to thank all of you for taking the time to help me understand the problem
February 3, 2011

Algebra-I'm still stuck
The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated. Algebra - helper, Wednesday, February 2, 2011 at 7:...
February 3, 2011

The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated. Algebra - helper, Wednesday, February 2, 2011 at 7:...
February 2, 2011

Algebra
I don't know if this is right but this is what I came up with. f^-1=(-7x+1)/(x-4) domain f(^-1)=(-inf,-7)U(-7,inf) range f(^-1)=(-inf,4)U(4,inf) Let me know if it looks right. Thanks
February 2, 2011

Algebra
Ok I got another one I can figure out The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated.
February 2, 2011

Solve the following inequality. (x-4)/(-x+2)>0 Write your answer using interval notation. x<2 or x>4 Thanks
February 2, 2011

Algebra
Graph the equations y=2|x-5|+2
January 26, 2011

Algebra
I don't understand what else do I need to do?
January 25, 2011

Algebra
Find the equation of the quadratic function f whose graph is shown below. Ponts on the graph are (-3,-1)(-2,-4) f(x)=
January 25, 2011

Math
The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth
January 25, 2011

Algebra
The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth.
January 24, 2011

Math-word problem
I got Let t = number of hours hall is rented then 180t + 4200 <= 5100 . Solving for t: 180t <= 900 t <= 5 hours
January 24, 2011

Math-word problem
To rent a certain banquet hall, there is a reservation fee of \$4200.00 and an additional fee of \$180.00 per hour. The Russell family wants to spend at most \$5100.00 on renting the hall. What are the possible amounts of time for which they could rent the hall? Use t for the ...
January 24, 2011

Algebra
January 23, 2011

Algebra
To rent a certain banquet hall, there is a reservation fee of \$4200.00 and an additional fee of \$180.00 per hour. The Russell family wants to spend at most \$5100.00 on renting the hall. What are the possible amounts of time for which they could rent the hall? Use t for the ...
January 23, 2011

Algebra
thanks
January 23, 2011

Algebra
The function h is defined by h(x) . 6+x/4+2x Find h(2x)
January 23, 2011

Algebra
The function h is defined by h(x) . 6+x/4+2x Find h(2x)
January 23, 2011

Algebra
Multiply. x-(6+2i)][x-(6-2i)] Note that these expressions contain complex numbers. Simplify your answer as much as possible.
January 23, 2011

Math ratio word problem
The ratio of horseshoes to shamrocks was 11 to 5, and two times the number of shamrocks was 12 less than the number of horseshoes. How many were shamrocks? thank you :)
January 3, 2009

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