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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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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
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Explain the process of mitosis

The process of mitosis produces 2 genetically identical daughter cells. It can be remembered using the acronym PMAT. P rophase : Chromatin supercoils and condenses into chromosomes (which are now visible). T...
RJ
Answered by Risha J. • Biology tutor
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A bag contains 5 red beads and 7 blue beads. Two beads are removed at random without replacement. Workout the probability that the two beads are the same colour.

This question is most simply solved with a probability tree diagram, where you just follow the paths of picking two same coloured beads. The first branch would be picking two red beads. P(R1) = 5 / 12, and P...
WM
Answered by Will M. • Maths tutor
11947 Views

How do you find the equation of a circle?

The equation of a circle is given in the form (x-a) 2 + (y-b) 2 = r 2 , in which the centre of the circle is (a,b) and the radius of the circle is 'r'. If you can figure out or are given the co-ordinates of ...
ZK
Answered by Zeeshan K. • Maths tutor
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