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Give one example of a sea defence and suggest how it helps protect the coastline, also commenting on its effectiveness.

One example of a sea defence structure is a sea wall. Sea walls are used to dissipate and reflect wave energy back into the sea, reducing erosion. The wave energy reaches the sea wall, and due to the soli...

Answered by Charles N. • Geography tutor

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Describe and evaluate one strength and weakness for the genetic hypothesis for schizophrenia

Schizophrenia is known to run in families, with occurrence in less than 1% of the general population, but 10% for those with first degree relatives. This risk is even higher with identical twins, with tho...

Answered by Aleks S. • Psychology tutor

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A curve is defined by the parametric equations x = 3^(-t) + 1, y = 2 x 2^(t). Show that dy\dx = -2 x 3^(2t).

Write 3^(t) as an expression involving x : We can rewrite x = 3^(-t) + 1 as x - 1 = 3^(-t) ; equivalently, 3^(t) = (x-1)^(-1). Substitute this expression into y, to write y in terms of x: y = 2 x 3^(t) = ...

Answered by Maleeha K. • Maths tutor

3106 Views

expand and simplify (x+1)(x-1)

first begin by expanding the brackets using the CLAW method (shown using whiteboard diagram)multiply the first of each bracket together, we get x²multiply the first term of the first bracket an...

Answered by Adam T. • Maths tutor

7218 Views