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If x^2 + y^2 = 20 and y=10 - 2x, find x and y.

First work out y² using the second equation, making sure to do this using the FOIL technique. Then substitute this into the first equation to get 5x² - 40x - 80 = 0. All the terms in...

Answered by Sara T. • Maths tutor

7905 Views

Draw a graph on the effect of an increase in temperature on the rate of an enzyme controlled reaction. Explain the shape of the curve and suggest why the temperature of a mammal is maintained just below the optimum temperature.

As kinetic energy increases, enzyme and substrate molecules collide with more frequency allowing more enzyme substrate complexes to be formed. With increasing temperature, the tertiary structure of the pr...

Answered by Sadia Z. • Biology tutor

6069 Views

How can I efficiently plan an essay in an exam?

It is always helpful to plan your essay before you begin. Planning is essential to have a clear, confident argument. Once you have selected your question, loosely annotate it - underlining key words (like...

Answered by Emily D. • English tutor

1578 Views

To what extent is (third degree) price discrimination beneficial to consumers and producers?

Third degree price discrimination refers to when a profit-maximising firm has two different prices for different demand groups, for example, a cinema would charge the student group less than what they cha...

Answered by Acacia T. • Economics tutor

2493 Views

What is epigenetic control of gene expression? How does it occur?

Strictly speaking, it is the heritable changes in the function of your genes that do not involve a change in your DNA's base sequence. Simply put, it is the way in which we regulate wheth...

Answered by Fareema F. • Biology tutor

2222 Views