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Three identical isosceles triangles are joined together to make a trapezium. Each triangle has base b cm and height h cm. Work out an expression, in terms of b and h for the area of the trapezium.

Formula for the Area of a triangle: A = (base x height)/ 2 Here we have three identical triangles. Therefore the formula for the Area of the three triangles: A = (b x h) x 3 / 2 = A of trapezium. Can be simp...
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Answered by Megan C. • Maths tutor
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If blood glucose level is high, how does it return back to normal?

When a high blood glucose level is detected by the body, pancreas releases the hormone, insulin, into the bloodstream. The release of insulin results in glucose moving from the blood and into liver and muscl...
SM
Answered by Samantha M. • Biology tutor
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Solve the differential equation csc(x)*dy/dx=exp(-y), given that y(0)=0. (Typical Math HL paper 3 question, Calculus optional topic)

Firstly, we need to grasp the problem, and understand what the question is asking us to do. We are given a differential equation, and we are required to solve for y, i.e. write y as a function of x: y(x)=......
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Answered by Khariton G. • Maths tutor
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What is the best way to revise for a speaking exam?

In terms of speaking exams, the most cliché answer is practice, practice and practice! The advice that used to help me a lot when revising for a speaking exam is to record yourself speaking and then listenin...
HO
Answered by Hazel O. • German tutor
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In a population of 1000 lemmings there are two alleles for skin colour, the dominant colour being cream (C) and the recessive being white (c). 350 individuals have white skin. Use Hardy-Weinberg to predict the number of homozygous recessive individuals.

Hardy-Weinberg Principle states that in a population of randomly mating individuals: p + q = 1 p 2 +2pq+q 2 =1 White fur = homozygous recessive = q 2 = 350/100 = 0.35 Therefore q = sqrt(0.35)=0.59 (2sf)p = 1...
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Answered by Igbunu O. • Biology tutor
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