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Maths
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How is frequency density calculated?

Frequency divided by class width

UY
Answered by Umamah Y. • Maths tutor
11862 Views

y is proportional to x^2. When y is 75, x is 5. Find a formula for y in terms of x

y is proportional to x2 so this means y = A*x2 for some constant A.

When y = 75, x = 5. Put these values in the formula above to find A:

75 = A*25

<...
TM
Answered by Thomas M. • Maths tutor
5676 Views

Differentiate 4x^2 + 2ln3x + e^x

To differentiate x2 you bring the power of x down, then reduce the power of x by 1, so d/dx(x2) = 2x1

ln3x differentiates to (d/dx(3x))/3x = 3/3x = 1/x

TM
Answered by Thomas M. • Maths tutor
7747 Views

Differentiate x^2+4x+9.

To differentiate you must look at each term separately. So for x^2 to differentiate we bring the two down to multiply in front of the x and then take one away from the power leaving 2x. For 4x, x is to...

IW
Answered by Iman W. • Maths tutor
6101 Views

A table has diameter 130cm. What is the area, as a multiple of Pi

Since the diameter is 130cm, the radius is half of this, so it is 65cm

Area is Piradius2. This means the area is Pi(65cm)2

This means the area...

JP
Answered by Jesse P. • Maths tutor
6241 Views

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