# Posts by Alex

Total # Posts: 3,677

**Physics**

Find the magnitude of the sum of two forces, one 24 N and the other 9 N, when the angle between them is 60.0o.

*February 7, 2015*

**Physics**

What should be the angle between two vectors of magnitudes 4.10 and 4.40 units, so that their resultant has a magnitude of 3.90 units?

*February 7, 2015*

**Physics**

The blocks A and B are connected by a piece of spring. Block B rests on a smooth inclined plane of 35° and block A hangs vertically. Calculate the acceleration of the system if the mass of block A is 1.06 kg and that of block B is 6.4 kg

*February 7, 2015*

**Algebra 2**

Simplify each expression. 1+sqrt(3) ______________ sqrt(3)-sqrt(2) *this is a division radical expression please show work!!

*February 7, 2015*

**Algebra 2**

Simplify this expression sqrt(3y^3)*sqrt(4xy^4)*sqrt(6x^5y^2) Please show work!!!

*February 7, 2015*

**Statistics**

25

*February 6, 2015*

**physics**

An arrow is shot straight upward into the air and it returns to the ground with a speed of 28m/s. What was the maximum height reached by the arrow?

*February 5, 2015*

**algebra**

mean

*February 5, 2015*

**physics**

A 98.0 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 49.5 m/s. If both are initially at rest and if the ice is frictionless, how far does the player recoil in the time it takes the puck to reach the goal 13.5 m away?

*February 3, 2015*

**Math 20-1**

The most convenient test point to use to determine if the points in a region defined by y<1.4x+0.6 satisfy the inequality is

*February 1, 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)

*February 1, 2015*

**Calculus**

Write 2.445353535353... as a fraction I'm learning integrals right now and this is part of the exercises under it. Is there a trick to this? Using integrals? Thank you very much!

*January 31, 2015*

**Science**

Kate don"t you see that the ** means corect answer. it did help me get an A on my math test

*January 29, 2015*

**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*

**Science**

The answer is A. point source

*January 28, 2015*

**English**

wow I got em' right XD

*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*

**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*

**Science**

100% right thanks

*January 16, 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*