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Calculate the length of PR. Give your answer correct to 3 significant figures (Diagram displayed on whiteboard)

In order to work out the unknown length of the triangle side PR, we first must identify which trigonometry equation to use. The digram gives us three values- 1 side and 2 angles. We know the hypotenuse (the ...
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Answered by Ali A. • Maths tutor
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Explain the main thermoregulatory processes in humans.

Thermoregulation involves both trying to increase and decrease our body temperature in order to maintain a temperature of 37 degrees celsius. Four main processes exist- convection , conduction , radiation an...
HW
Answered by Harvey W. • Biology tutor
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List five (5) risk factors for coronary heart disease, and briefly outline a piece of evidence for each one (5)?

(Chapter: further human physiology) Factor + explanation (1 point for each) for coronary heart disease (CHD):-Genetics: CHD tends to run in some families-Age: CHD is a disease of old age-Gender: men are more...
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Answered by Dimitrios K. • Biology tutor
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The value of a car depreciates by 35% each year. At the end of 2007 it was £5460. Work out the value of the car at the end of 2006.

-This question wants us to work backwards.Let N be the value of the car in the year 2006. Find the multiplier . 1-0.35 = 0.65. Hence N * (0.65) = £5460. Rearrange for N. N = £8400
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Answered by Rithvik G. • Maths tutor
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The second and fifth terms of a geometric series are 750 and -6 respectively. Find: (1) the common ratio; (2) the first term of the series; (3) the sum to infinity of the series

x n = ar (n-1) (1) x 2 = 750 = ar 1 (2) x 5 = -6 = ar 4 divide second equation by first-6/750 = r 3 r 3 = -0.008r= -0.2Insert into first equation.750 = a * -0.2a = -3750Sum to infinite series = a(1/(1-r))(in...
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Answered by Henry P. • Maths tutor
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