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y is proportional to x^2. When y=45, x=3. Find a formula for y in terms of x.

If y is proportional to x then you can write y=kx^2 where k is a constant you are trying to find. Then substitute in the values you have been given for x and y. This gives you 45=k(3)^2. Then work to solv...

Answered by Abbey P. • Maths tutor

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What is the difference between the perfect and imperfect tenses in French and when are they used?

There are mainly two tenses used in French to discuss what happened in the past, these being: the perfect and imperfect.However, both of these tenses are used in different ways based on what the speaker i...

Answered by Joe H. • French tutor

4532 Views

Find the inverse of a 2x2 matrix

Consider the 2x2 matrix M, consisting of elements a, b, c and d. To find its inverse one must first find the det...

Answered by Giovanni D. • Maths tutor

3322 Views

Explain why a demerit good is overconsumed, if left to market forces.

A demerit good is a good which has a negative impact on its consumer and others in society. An example of this is alcohol, which can cause health problems for people who drink it, but also leads to extern...

Answered by Henry H. • Economics tutor

14502 Views

Find the stationary point of the graph of y = 2x + 5 + 27x^(-2)

y = 2x + 5 + 27x^-2To find a stationary point, find the gradient function by differentiating with respect to x:y' = 2 -54x^-3To find a stationary point, let the gradient function equal...

Answered by Henry H. • Maths tutor

3398 Views