 # Emma Ghanem

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Maths

Asked by Trisha · 2 years ago

Find the curved surface area of closed cylinder?

Curved surface area of a cylinder = Pi x diameter of circle x height of cylinder

Maths

Asked by Amish · 2 years ago

Determine d/dx (3/1-5x)?

This is the same as 3(1-5x)^-1 So to differentiate, the 3 is multiplied by the -1 power (3x-1 is -3 ) and this is multiplied by -5 ( the differential of of 1-5x) to make 15 . Then the power (-1) is decreased by 1 to -2 So the answer is 15(1-5x)^-2 which is 15/((1-5x)^2)

Maths

Asked by Emily · 2 years ago

T is inversely proportional to the vibe of L, when L=0.2 T =5 Work out the value of L when T= 2?

T is inversely proportionate to L so T = k/L when T =5 L =0.2 So k= 0.2 x 5 = 1 So T = 1/L So when T=2 2L = 1 And L= 0.5

Maths

Asked by Emily · 2 years ago

Solve by completing the square. X^2 +4x -21 = ?

(X +2)^2 - 4 -21 = 0 (X +2)^2 =25 X +2= + or - 5 X = 3 , -7

Maths

Asked by James · 2 years ago

How do you divide something by a fraction?

You multiply it by the denominator of the fraction then divide that total by the numerator of the fraction

Maths

Zana thinks of a number. She multiplied it by 3, she adds another 3 and multiplies it by 3 again. Her answer is 90. What was her original number?

Assume the starting number = x (3x + 3)3 = 90 3x + 3 = 30 X = 9 # Emma Ghanem

Resourceful tutor and who is ready to teach!

345Students helped