Top answers

How is frequency density calculated?

Frequency divided by class width
UY
Answered by Umamah Y. • Maths tutor
12239 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 x 2 so this means y = A*x 2 for some constant A. When y = 75, x = 5. Put these values in the formula above to find A: 75 = A*25 75/25 = A A = 3 So y = 3x 2
TM
Answered by Thomas M. • Maths tutor
6059 Views

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

To differentiate x 2 you bring the power of x down, then reduce the power of x by 1, so d/dx(x 2 ) = 2x 1 ln3x differentiates to (d/dx(3x))/3x = 3/3x = 1/x e^x differentiates to (d/dx(x)) e^x = 1 e^x Therefo...
TM
Answered by Thomas M. • Maths tutor
8141 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 the p...
IW
Answered by Iman W. • Maths tutor
6542 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 Pi radius 2 . This means the area is Pi (65cm) 2 This means the area is Pi*4225cm 2
JP
Answered by Jesse P. • Maths tutor
6715 Views