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Solve the following simultanious equations: zy=28 and 2z-3y=13

zy=28 so y=28/z13=2z-3y13= 2z - (28 x 3)/z13=2z-84/zmultiply each side by z to give 13z = 2z 2 -84rearange for a quadratic2z 2 -13z-84=0solve by factorising(2z+8)(z-21/2)z= -4 0r 21/2substitute -4 into both ...
OB
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Explain how petrol and diesel cars may be a source of market failure?

As with many questions in economics A-level, I would start my answer with a paragraph explaining how under certain assumptions, an efficient allocation of resources can be achieved through the market mechani...
DO
Answered by Daniel O. Economics tutor
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Describe and Evaluate the work of Milgram?

Milgram (1963) conducted a social psychology experiment to investigate to what level individuals would be obedient to an authority figure. Participants arrived in pairs and he instructed them that the experi...
LS
Answered by Laura S. Psychology tutor
3108 Views

Compare and contrast aerobic and anaerobic respiration.

Aerobic respiration requires oxygen to completely break down glucose and produce energy. The equation is C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O. Anaerobic respiration, on the other hand, does not require oxyge...
TB
Answered by Tobias B. Biology tutor
13894 Views

How do you structure a GCSE English answer?

In English literature, an answer must be structured in a specific manner. The best way to do this is use the PEE method. This is point, evidence and explanation. If the question asks about how a certain them...
YD
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