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Discuss the difference between sharpness and contrast in x-ray imaging

Sharpness describes how well the edges of structures in an x-ray image are defined, while contrast describes the difference in degree of blackening of adjacent structures.
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Answered by Tomas M. • Physics tutor
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Solve for x: y=x^2-x-12

Apply the quadratic formula with a=1, b=-1, c=-12. This gives x=(1 plus or minus 7)/2 or x=4,-3.
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Answered by Tomas M. • Maths tutor
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Solve the simultaneous equations - x+y=2 and 4y^2 - x^2 = 11

The objective of simultaeous equations is to be able to work out two unknowns by using two equations in which they are both involved. The first step is to label the equation x+y=2 as equation 1 and 4y 2 - x ...
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Answered by Keshlee C. • Maths tutor
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What is the role of the kidney in water homeostasis?

The kidney has several functions, but in this short paragraph I am going to explain about it's principal function- controlling water levels in the body. Imagine you are in a desert and you have not had a dri...
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Answered by Grace R. • Biology tutor
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Find the nth term in the series: 3, 7, 11, 15, 19

Find the difference between each value. 7-3, 11-7 ... For this series the difference is 4. The nth term is then 4n + or - a constant. The series is 3, 7, 11.. each of these is 1 below a multiple of 4. 4 1- 1...
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Answered by Hermione W. • Maths tutor
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