2,563 Answered Questions for the topic Maths

Maths Integer

11/05/15

integer values
"Show that (n+3)^2-(n-3)^2 is an even number for all positive integer values of n"   I would like to know how to workout this type of question.   Thank you in advance.
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Maths Density

11/05/15

Density question (maths)
"Liquid A has a density of 0.7g/cm^3. Liquid B has a density of 1.6g/cm^3.   140 g of liquid A and 128g of liquid B are mixed to make liquid C.   What is the density of liquid C?"   I would... more
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Maths Bearings

11/05/15

Bearings (maths question)
"Martin and Janet are in an orienteering race.   Martin runs from checkpoint A to checkpoint B, on a bearing of 065° Janet is going to run from checkpoint B to checkpoint A.   Work out the... more
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Maths Coordinates

11/05/15

Coordinates question (maths)
"The points A, B and C lie in order on a straight line.   The coordinates of A are (2, 5) The coordinates of B are (4, p) The coordinates of C are (q, 17)   Given that AC= 4AB, find the... more
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11/04/15

Please help me with the following mathematical question.
Rescue Option 2: Rescue BoatThere is a rescue boat that is already out at sea at R. However, it receives distress calls from the yacht and another boat, at the same time.The rescue boat must go to... more
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11/04/15

Please help me with the following mathematical question
There is a rescue boat that is already out at sea at R. However, it receives distress calls from the yacht and another boat, at the same time.-The rescue boat must go to the nearest distress call... more
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11/04/15

Please help me get x alone.
8100=x^2 + 25600-2x2cos(90)   Thanks so much
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11/01/15

multiple choice exam where probability of correct answer is different from if you know it or gamble
A student takes a multiple-choice exam. Suppose for each question he either knows the answer or gambles and chooses an option at random. Further suppose that if he knows the answer, the probability... more
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Maths

10/30/15

the present value of £100 when discounted at 14% is £87,7 and £90.9 at 10%. what is the difference, is it 3.4 3.5%, how do you get the answer
maths question
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Maths

10/29/15

kerry earns £15 per week for a part time job how must she work to save up £300
Im not sure what the sum is need an answer
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10/29/15

There's a rectangular box which is 36 cm long, 27 cm wide and 28 cm high. Find the length of the longest rod that can be placed in the box.
I only know how to calculate a diagonal but the longest length here would be a '3d diagonal' which I'm not sure how to do
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10/26/15

Baryon to photon ratio urgent help
I am having trouble showing that the baryon to photon ratio isη= nb/nγ ~ 2.7x10-8Ωbh2where nb and nγ are the number density of baryons and photons respectively, Ωb is the baryon density parameter... more
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10/25/15

This is an open question so there are no answers in the textbook, is there any methodical solution that is not trial and error? Please keep it simple!
An engineer designs a slide for a playground. As shown in the diagram, the slide AB is 20 cm long. Angle ACB is 90°. The gradient of the slide is required to be greater than 1/2 but less than 1.... more
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Maths

10/23/15

Subject of formula
Hey guys,    I am confused with this question, I need help.   Make (a) the subject of the formula   1) p(a+b)=q(a-b)     Is the answer: A=-pb-pb/p-q
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10/22/15

Deuterium synthesis baryon to photon ratio
The synthesis of heavier elements started with the formation of deuterium (n+p -> D+γ). Deuterium has a binding energy BD = 2.22MeV, so we might expect that deuterium forms when kT ~ BD, since a... more
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Maths

10/18/15

Basic Hydraulics Fluids - Text Book Problems
Question. 3   A horizontal water pipe diameter 15 cm converges to 7.5 cm diameter. If the pressures at the two sections are 4 kgf/cm2, and 1.5 kgf/cm2 respectively, calculate the flow rate of... more
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Maths Wavy Curve

10/06/15

solve (x-7)(x+2)>0
(x+a)(x+b)>0
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Maths

10/04/15

find the volume and the total surface area of a right circular solid cylinder whose radius is 7 cm and height is 30 cm
find the volume and the total surface area of a right circular solid cylinder whose radius is 7 cm and height is 30 cm  just explain me answer
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Maths

09/30/15

360 spectators were at a rugby match at the stadium. 60% of the spectators were male and the rest were female.
360 spectators were at a rugby match at the stadium. 60% of the spectators were male and the rest were female. (a) How many females were at the stadium? (B) After some females left the stadium 80%... more
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Maths

09/28/15

How many Pieces of wood would be required and the number of pieces you actually need for the finishing?
Finishing the Quad SeatingThe Quad area has a new section on the full length of one side.The top of he seating is to have a wood finish which is o go to the full length of 26 meters.The piece wood... more
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Maths

09/20/15

A floor measures 5.25m by 4.5m. It is to be covered with square carpet tiles of side 25cm. tiles are sold in boxes of 24. How many boxes are needed
How to work it out
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Maths Volume

09/17/15

I have 2 hemispheres witha radius of 9m, on either side of a cylicnder with a height of 30m
1) Find the volume, correct to 2 decimal places.   2) If all its lengths are scaled up by 4, what is the new volume?   3) If all its lengths are acted on by a scale factor of 0.5, what is the... more
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Maths Volume

09/17/15

I have a cone with a height of 21m, on a hemisphere with a radius of 2.5m.
a) Find the volume, correct to 2 decimal places.   b) If all the lengths are scaled up by 2, what is the new volume?   c) If all its lengths are acted on by a scale factor of 1/4 what is the... more
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Maths Volume

09/17/15

COnsider a box of tennis balls where as many balls are stacked across the bottom as possible. There are six balls on the bottom of the box.
Please help me.   You have a larger box of tennis balls. The dimensions of the box are 30cm long, 30cm wide and 30cm high. The radius of each ball is 3cm   a) If you stack the balls as close... more
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Maths

09/17/15

Find the coordinates of the point which is three-fifth of the way from (3,4,5) to (-2,-1,0)
Find the coordinates of the point which is three-fifth of the way from (3,4,5) to (-2,-1,0)
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