Friday
January 30, 2015

Posts by ALEX


Total # Posts: 2,840

Math 20-1
What is the solution for 2x^2-7x>-3? (2 marks) (Show your work)
January 29, 2015

Math 20-1
A boundary line that is dashed is represented by the inequality symbol: ?
January 29, 2015

Math 20-1
The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm^2? (2 marks)
January 29, 2015

physics
Heather and Matthew walk eastward with a speed of 0.90 m/s east. If it takes them 31 min to walk to the store, how far have they walked? Answer in units of km.
January 29, 2015

Math
Using this graph, find the average lengths of cellular calls for the year 2013. Year:|Avg length (L) in minutes: 1999|2.38 2000|2.56 2001|2.74 2002|2.73 2003|2.87 2004|3.05 I think the answer is 4.08 minutes but I also got 3.97 so I'm not sure, can you tell me if I'm ...
January 29, 2015

Math 20-1
The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm^2? (2 marks)
January 28, 2015

Math 20-1
What is the solution for 2x^2-7x > always greater than -3 ? (2 marks) (Show your work)
January 28, 2015

algebra
what would the length of a spring be if a 4 lb weight stretched a spring to 20in and a 16 lb weight stretched a spring 26in
January 27, 2015

Chemistry
When iron rusts in air, iron (III) oxide is produced. How many moles of oxygen react with 7.2 mol of iron in the rusting reaction? 4Fe(s)+3O2=2Fe2O3(s)
January 27, 2015

Math 20-1
Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modeled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. (2 ...
January 27, 2015

math
Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark) Here's my work on it: kx^2-5x+2=-3x+4 kx^2-2x-2=0 a)b^2-4ac (-2^2-4(1)(-2) (-4--8) (4) ...
January 27, 2015

math
Can you please show your work as to how you got this answer?
January 26, 2015

math
A square storage area measures 10 m on a side. By how much must each side be shortened to decrease this area to less than half the original area? (3 marks - show your work)
January 26, 2015

math
The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm2? (2 marks)
January 26, 2015

math
Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modelled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. (2 ...
January 26, 2015

math
Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark) Please and thank you!
January 26, 2015

math
Here's my question: Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the ...
January 26, 2015

math
Here's my question: Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the ...
January 26, 2015

math
Here's my question: Determine if each system has one, two, or no solutions. (Show your work - 3 marks each) a)y=2x^2-2x+1 and y=3x-5 b)y=x^2+3x-16 and y=-x^2-8x-18 Here's my work on the question: a) x=(-b plus/minus sign (square root b^2-4ac)/(2a) x=(--2 plus/minus ...
January 26, 2015

math
Determine if each system has one, two, or no solutions. (Show your work - 3 marks each) a)y=2x^2-2x+1 and y=3x-5 b)y=x^2+3x-16 and y=-x^2-8x-18
January 26, 2015

math
Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the fireworks is y=-x^2+15x, ...
January 26, 2015

math
Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the fireworks is y=-x^2+15x, ...
January 26, 2015

math
So I use the quadratic formula?
January 26, 2015

math
Determine if each system has one, two, or no solutions. (Show your work - 3 marks each) a)y=2x^2-2x+1 and y=3x-5 b)y=x^2+3x-16 and y=-x^2-8x-18
January 26, 2015

math
Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark)
January 26, 2015

math
Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark)
January 23, 2015

math
For what value of b will the line y=-2x+b be tangent to the parabola y=3x^2+4x-1 ? (Show your work - 2 marks)
January 23, 2015

english
expletive
January 23, 2015

english
Choose the correct sentence pattern for the sentence below. There is good reason to be thankful. E-V-S S-V-DO-OC S-LV-PA S-V-DO S-V-IO-DO S-V S-LV-PN Question pattern
January 23, 2015

math
For what value of b will the line y=-2x+b be tangent to the parabola y=3x^2+4x-1 ? (Show your work - 2 marks)
January 23, 2015

math
The UV index on a sunny day can be modeled by the function f(x)=-0.15(x-13)^2+7.6 where x represents the time of day on a 24-h clock and f(x) represents the UV index. At what time(s) was the UV index 7? (2 marks)
January 23, 2015

physics
A 1100·kg elevator is attached to a cable whose tension is 10900·N. What is the magnitude of the elevator's acceleration?
January 23, 2015

math
Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^2-2x-3
January 23, 2015

math
A square storage area measures 10 m on a side. By how much must each side be shortened to decrease this area to less than half the original area? (3 marks - show your work)
January 22, 2015

math
A baseball player hits a high pop-up with an initial upward velocity of 30 m/s, 1.4 m above the ground. The height, h, in metres, of the ball t seconds after being hit is modelled by the function h(t) = -4t^2+30t+1.4. How long does a player on the opposing team have to get ...
January 22, 2015

Algebra 1
No
January 22, 2015

math
Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the fireworks is y=-x^2+15x, ...
January 22, 2015

math
Determine the value of k in y=kx^2-5x+2 hat will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark)
January 22, 2015

math
Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^2-2x-3
January 22, 2015

math
Four corners are cut from a rectangular piece of cardboard that measures 5 ft by 3 ft. The cuts are x feet from the corners, as shown in the figure below. After the cuts are made, the sides of the rectangle are folded to form an open box. The area of the bottom of the box is ...
January 22, 2015

math
The graph of a reciprocal function of the form f(x)=1/ax+b where a is not equal to 0 and b is not equal to 0. Which is the equation of the original function f (x)? a)y=5.25x-2 b)y=-5.25x+2 c)y=-5.25x-2 d)y=5.25x+2
January 15, 2015

math
Four corners are cut from a rectangular piece of cardboard that measures 5 ft by 3 ft. The cuts are x feet from the corners, as shown in the figure below. After the cuts are made, the sides of the rectangle are folded to form an open box. The area of the bottom of the box is ...
January 15, 2015

Math
I have figured out x to be 2 for this system of equations but now I need help on determining the solution of the equations which are y=4x and y=2x^2. Can you please help me!
January 15, 2015

Math
Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark)
January 15, 2015

Math
For what value of b will the line y=-2x+b be tangent to the parabola y=3x^2+4x-1? Show work-2 marks
January 15, 2015

math
The line y=16x intersects the quadratic function y=x^2 at two points. What are the coordinates of the two points of intersection?
January 14, 2015

math
Solve the following system of equations: y=4x y=2x^2
January 14, 2015

math
What are the solutions for the following system of equations? y=8x+7 y=-x^2-5x+7
January 14, 2015

math
The line y=9x-4 intersects the quadratic function y=x^2+7x at one point. What are the coordinates of the point of intersection?
January 14, 2015

Math
A 120-ft long playground is just 15-in on the scale drawing.What is the scale on the scale drawing? How would you solve this question?
January 14, 2015

Economics
5. (paradox of) VALUE = (blank) + (blank). 16. (Blank) is a situation when production cannot reach its full potential because resources are available, but not being used. These are the only two questions that I can't figure out on my study guide. Help? Please and thank you...
January 12, 2015

Math
The solution set to the inequality:-2x^2+8x-6>0 is ?
January 12, 2015

Math
A scientist is monitoring the temperature of a holding tank containing fish to be released into a river. In one 12-h period, the highest temperature was 10.4°C and the lowest temperature was 7.6°C. Write an absolute value equation that can be used to report the highest...
January 12, 2015

Math
The velocity of an object is given by the formula v=25t-80, where the time is expressed in seconds and the velocity is expressed in feet per second. Find the times when the magnitude of the velocity is equal to 60 ft/s. (3 marks)
January 12, 2015

Math
A scientist is monitoring the temperature of a holding tank containing fish to be released into a river. In one 12-h period, the highest temperature was 10.4°C and the lowest temperature was 7.6°C. Write an absolute value equation that can be used to report the highest...
January 11, 2015

physics
A golf ball (m = 35.4 g) is struck a blow that makes an angle of 61.8 ◦ with the horizontal. The drive lands 176 m away on a flat fairway. The acceleration of gravity is 9.8 m/s 2 . If the golf club and ball are in contact for 3.01 ms, what is the average force of impact...
January 11, 2015

Math
I have the ratio for this question but I need help with finding the value of ratio using the ratio I came up with: ratio of V/SA=x/(100+2x) Here's the question: d) Find the value of the ratio for the box for each value of x. (1 mark each) i) 10 cm ii) 20 cm iii) 30 cm
January 11, 2015

Math
A square sheet of cardboard 100 cm by 100 cm is to have corners of side length x cut out. These cutouts will create flaps that can be folded up to form a box with no lid. The length and width of the base of the box are given by the expression (100 – 2x), and the height of...
January 11, 2015

Math
Thanks,Reiny for all your help with my math!
January 11, 2015

Math
A square sheet of cardboard 100 cm by 100 cm is to have corners of side length x cut out. These cutouts will create flaps that can be folded up to form a box with no lid. The length and width of the base of the box are given by the expression (100 – 2x), and the height of...
January 11, 2015

Math
Would these simplified expressions by equivalent to these expressions: i)f(x)=-3(x+2)^2 ii)f(x)=x^2-x-2 / 3x^2+4x+1 Simplified expressions: i)-3x^2-13x-13 ii)(x-2)(3x+1) Please help me!
January 10, 2015

Math
Simplify the expressions in each pair. (2 marks each) (Show your work) (x^2-2x)/(x+1)x (x^2-1)/(x^2+x-6) My work on simplifying the expressions x(x-2)/x+1 x (x+1)(x-1)/(x+3)(x+2) If I've gone wrong please help me understand where I went wrong and help me get the correct ...
January 10, 2015

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) 4x-1/x^2+7x+12 divided by 2x-1/x^2+x-12 My work on simplifying the expressions: 4x-1/(x+3)(x+4)divided by 2x-1/(x+4)(x-3) If I've gone wrong please help me understand where I went ...
January 10, 2015

Math
Simplify the expressions in each pair. (2 marks each) (Show your work) (x^2-2x)/(x+1)x (x^2-1)/(x^2+x-6) My work on simplifying the expressions x(x-2)/x+1 x (x+1)(x-1)/(x+3)(x+2) If I've gone wrong please help me understand where I went wrong and help me get the correct ...
January 10, 2015

Math
So for these simplified functions would they be equivalent to these functions: Is -3x^2-13x-13 equivalent to f(x)=-3(x+2)^2 Is [(x-2)(x+1)]/[3x+1)(x+1] equivalent to f(x)=(x^2-x-2)/(3x^2+4x+1)
January 10, 2015

Math
Damon so are the simplified versions of the functions equivalent to their respective functions?
January 10, 2015

Math
My work on simplifying this function: g(x)=(-3x^2-13x-13) g(x)=-3x^2-13x-13 (13x-13=x) g(x)=-3x^2-x Can someone help with the simplifying the function if I have got it wrong and also can someone tell me of it's equivalent to this function:f(x)=-3(x+2)^2-(x+1) Also I have ...
January 10, 2015

Math
Simplify the expressions in each pair. (2 marks each) (Show your work) i) (x^2-x-2)/(x+1),g(x)=(x-2) My work on simplifying the functions: (x-1)(x+2)/(1) (x-1)(x+2) ii) (x^2-x-12)/(x+3), g(x)=(x^2-6x+8)/(x-2) My work on simplifying the functions: (x-2)(x+6)/(3) (x-4) Can you ...
January 10, 2015

Math
Simplify the expressions in each pair. (2 marks each) (Show your work) i)f(x)=(x^2-x-2)/(x+1), g(x)=(x-2) ii)f(x)=(x^2-x-12)/(x+3), g(x)=(x^2-6x+8)/(x-2)
January 10, 2015

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) (4x-1)/(x^2+7x+12)divided by (2x-1)/(x^2+x-12)
January 10, 2015

Math
Yes I am,and I'm so sorry for reposting it but thanks for helping me Reiny.
January 10, 2015

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) (x^2-2x)/(x+1) x (x^2-1)/(x^2+x-6)
January 10, 2015

Math
Simplify the expressions in each pair. (2 marks each) (Show your work) i)f(x)=(x^2)-(x)-2/(x+1),g(x)=(x-2) ii) f(x)=(x^2)-(x)-12/(x+3), g(x)=(x^2)-(6x)+8/(x-2)
January 10, 2015

Math
Have I done the predicting part of assignment, now I need help with the simplifying part of the assignment. Can you please help me? Here are the functions: g(x)=(-3x^2)-(13x)-13 g(x)=(x-1)/(3x+1)
January 10, 2015

Math
Solve and check. ( 3 marks) 5/(x-1) + 2/(x+1)=-6 Here's my work on it: 5/(x-1)+2/(x+1)=? 5/(-3/2-1)+2/(-3/2+1)=-6 Can you show how I would have found x in this situation and also if I went wrong anywhere.
January 9, 2015

Math
Thanks for your help,Damon
January 9, 2015

Math
Can you please verify my simplified expressions and point out where I went out wrong if I made mistakes: (3x+1)/(2x^2-2) + (2x+2)/(2x^2-8x+6)=5x+1/2(x+1)(x-3)
January 9, 2015

Math
Solve and check. ( 3 marks) (5)/(x-1) + (2)/(x+1)=-6
January 9, 2015

Math
Solve and check. ( 3 marks) (5)/(x-1)+(2)/(x+1)=-6 I need the help!
January 9, 2015

Math
Simplify each expression and state any non-permissible values. (5 marks - show your work) (3x+1)/(2x^2-2) + (2x+2)/(2x^2-8x+6) Please help me!
January 9, 2015

Math
i) Predict whether the functions in each pair are equivalent by testing three different values of x. (3 marks each - show your work) ii) Determine whether the functions in each pair are equivalent by simplifying the expression on the right side. (2 marks each = show your work...
January 9, 2015

Math
Determine if the function f(x) is the simplified form of g(x). If it is, state the non-permissible values. If it is not, determine the corrected simplified form, including the non-permissible values. (2 marks) - Show your work g(x)=(2x^2-7x+3)/(x-3) f(x)=(2x+1)
January 9, 2015

Math
Determine if the function f(x) is the simplified form of g(x). If it is, state the non-permissible values. If it is not, determine the corrected simplified form, including the non-permissible values. (2 marks - show your work) g(x)=(6x^2)+(x-12)/(2x+3),f(x)=3x-4
January 9, 2015

Math
Thanks,Reiny
January 9, 2015

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) x^2-2x/(x+1) x x^2-1/(x^2+x-6) Please help me as I'm on a deadline to finish this course
January 9, 2015

Math
Simplify each expression and state any non-permissible values. ( 3 marks - show your work) x/(x^2-3x-4) - 4/(x+1)
January 9, 2015

Math
Simplify each expression and state any non-permissible values. ( 3 marks - show your work) x/x^2-3x-4 - 4/x+1
January 8, 2015

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) x^2-2x/x+1 x x^2-1/x^2+x-6
January 8, 2015

Math
Determine if the function f(x) is the simplified form of g(x). If it is, state the non-permissible values. If it is not, determine the corrected simplified form, including the non-permissible values. (2 marks) - Show your work g(x)=2x^2-7x+3/x-3, f(x)=2x+1
January 8, 2015

Math
Determine if the function f(x) is the simplified form of g(x). If it is, state the non-permissible values. If it is not, determine the corrected simplified form, including the non-permissible values. (2 marks - show your work) g(x)=6x^2+x-12/2x+3,f(x)=3x-4
January 8, 2015

Math
i) Predict whether the functions in each pair are equivalent by testing three different values of x. (3 marks each - show your work) ii) Determine whether the functions in each pair are equivalent by simplifying the expression on the right side. (2 marks each = show your work...
January 8, 2015

Math
Solve and check. ( 3 marks) 5/(x-1)+2/(x+1)=-6
January 8, 2015

Math
Simplify each expression and state any non-permissible values. ( 3 marks - show your work) x/(x^2-3x-4)-4/(x+1) Please help me!
January 8, 2015

Science
To lift an object weighing 21,000 N, how much force is needed on a piston with an area of 0.060 m2 if the platform being lifted has an area of 3.0 m2 ? If the weight is 21,000 N which is also a force and to find Buoyancy force then 3.0 m2 + .06 m2 = 3.6 m2 21,000/3.6 Im pretty...
January 7, 2015

Math
Simplify each expression and state any non-permissible values. ( 3 marks - show your work) x divided by x^2-3x-4 subtracted by 4 divided by x +1
January 7, 2015

Math
Solve: 1 + 2x/x+4=3/x-1
January 7, 2015

Math
Solve: 1+2x/x+4=3/x-1
January 7, 2015

Math
Simplify each expression and state any non-permissible values. (5 marks - show your work) 3x+1/2x^2-2 + 2x+2/2x^2-8x+6 is the expression Can you help please?
January 7, 2015

Math
Simplify each expression and state any non-permissible values. ( 3 marks - show your work) x/ x^2-3x-4 - 4/x+1
January 7, 2015

chemistry
dissolved oxygen in aquatic systems is important for the survival of freshwater fish and they require a minimum of 5 parts per million(ppm) of dissolved oxygen (02) in a stream lake to survive. although this amount seems small, how many oxygen molecules are in a litre of water...
January 6, 2015

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