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A cuboid has a rectangular cross section where the length of the rectangle is equal to twice its width x cm. THe volume is 81 cm^3. a) show that the total length L cm of the cuboid is given by L=12x+162/x^2

Volume=81 cm 3 b=81/2x 2 L=4x+4(2x)+ 4(b) L=4(x)+4(2x)+4(81/2x 2 ) L=12x+ 162/x 2
BT
Answered by Bilaal T. • Maths tutor
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How to make something the subject of the formula?

Make a the subject of the formula from : p = (3a + 5)/(4 - a) When doing questions like these it is best to remember that if you multiply one side of the equation you have to do the same thing on the other s...
RC
Answered by Robin C. • Maths tutor
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Solve the following equation: 6x – 9 > 4x + 3

2x - 9 > 3, 2x > 12, x > 6
SM
Answered by Sean M. • Maths tutor
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How to solve how many sweets Hanna had?

This was a GCSE question in 2015. There are n sweets in a bag. 6 of them are orange, the rest are yellow. Hanna takes a random sweet from the bag and eats it. She then takes another random sweet and eats tha...
CM
Answered by Callum M. • Maths tutor
4249 Views

How would you integrate ln x

You would use the product rule. uv'=uv- u'vdx. In this case we would allocate u= ln x and v'=1 so u'=1/x and v=x so uv=xlnx whilst u'v=x/x=1 so we would have xln(x) -1dx. Next we would get xln(x)-x +c
CM
Answered by Callum M. • Maths tutor
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