Top answers

What are the different development methodologies and what are their advantages and disadvantages?

Though there are others, the two main development methodologies (i.e approaches to developing software systems) are the "Waterfall" and "Agile" approaches. With the Waterfall approach, th...
MS
Answered by Matthew S. • Computing tutor
2322 Views

Differentiate with respect to x, x^2*e^(tan(x))

Use the product rule: d/dx(uv) = uv' + u'v, with u = x^2 and v = e^(tan(x)), so that u' = 2x and v' = sec^2(x) * e^(tan(x)), and so the answer is 2x * e^(tan(x)) + x^2 * sec^2(x) * e^(tan(x)) .
JH
Answered by Jakub H. • Maths tutor
5825 Views

Explain why alkenes can have stereoisomers

Alkenes have stereoisomers because no free rotation possible around the C=C double bond, as to do so would break the pi-bond between the two atoms. which requires energy to break.
JH
Answered by Jakub H. • Chemistry tutor
3722 Views

Find the area of the surface generated when the curve with equation y=cosh(x) is rotated through 2 pi radians about the x axis, with 2<=x<=6

Use the formula for the surface area of revolution, which requires dy/dx. So find dy/dx = sinh(x) and substitute dy/dx and y into the formula with the limits provided in the question (2 and 6). Then evaluate...
JH
5583 Views

Evaluate relative merits of monetary and fiscal policy measures for governments wanting reduced unemployment in the UK. (20 marks)

Introduction - definitions of monetary policy, fiscal policy, and unemployment. Monetary policy is expansionary - rate of interest decreased, value of savings decreased, spending increased, borrowing increas...
KB
Answered by Kira B. • Economics tutor
6233 Views