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Why is the human heart system described as double circulatory?

The human heart system is described as double circulatory becasue is has two seperate circuits. The first carries blood between the heart and the lungs and is known as the pulmonary circuit and the second ca...
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Answered by Suzannah E. • Biology tutor
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How can I show that the lines between sets of points are perpendicular?

For example, A(6/5, 19/5), B(2, 9/5), C(5, 3). Show that the line segments AB and BC are perpendicular. Before we begin the question, it is a good idea to remind ourselves of the definition of two lines bein...
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How can I solve equations like 2x + 3 = 8x + 21?

Questions like this ask you to solve an equation; this means to find a value of x that when put into the equation allows each side of the equation to be equal. There are three important rules to follow when ...
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Answered by Tutor87017 D. • Maths tutor
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We have the following fractions: 6/16, 9/24, 12/32 and 15/35. Which fraction is not equivalent to 3/8?

Numerator and denominator of a fraction 6/16 can be divided by 2 to get 3/8. Numerator and denominator of a fraction 9/24 can be divided by 3 to get 3/8. Numerator and denominator of a fraction 12/32 can be ...
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Answered by Karolina P. • Maths tutor
10279 Views

Suppose we have a circle whose radius is 5cm. If a sector of this circle has an area of 15 cm^2, what is the size its angle (in degrees)?

Firstly, you would need to figure out what formula you can use to solve this problem. You know the radius and area of the sector, and you need to find the angle. So, the correct equation to use would be the ...
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Answered by Roxani S. • Maths tutor
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