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Solve algebraically the simultaneous equations (x^2) + (y^2) =25 and y - 3x = 13 (5 Marks).

The solution to simultaneous equations is where the values of x and y satisfy both equations. In this case, we need to find values of x and y that satisfy the equations x 2 + y 2 =25 and y - 3x = 13. If we n...
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Answered by Vaibhav G. • Maths tutor
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A washing machine costs £500 in a sale and was reduced by 20%. What was its original price?

Maths is pretty straight forward, you just need to get the key information out the question.So, we have a washing machine that costs £500 on sale. It has been reduced by 20%, so we need to find the original ...
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Answered by Raghavi S. • Maths tutor
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Use calculus to find the set of values of x for which f(x) = x^3 - 9x is an increasing function.

f(x) is an increasing function when its gradient is positive. To find the the gradient of the the function we must differentiate it:d/dx f(x) = 3x 2 - 9. To differentiate we multiply the exponent by the coef...
Answered by • Maths tutor
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Define the term gland and give two examples of endocrine glands in the human body.

Definition: an organ or tissue that synthesises and secretes a chemical messenger such as a hormone into the blood plasma.Examples: pituitary gland, thyroid gland (other relevant).
Answered by • Biology tutor
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What is the difference between 'je serai' and 'je serais'?

Although both of these sounds the same when spoken out loud, 'je serai' is the first person singlular simple future conjugation of 'etre' - 'to be', (as in 'je serai, tu seras, il/elle/on sera, nous serons, ...
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Answered by Lily-Ann P. • French tutor
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