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How do you form the perfect tense?

The perfect tense states that an event/action has been completed or is in the past: you have done something, something happened, you were in a particular state etc. 1. The majority of verbs are formed in the...
RF
Answered by Rachel F. • French tutor
3539 Views

If f(x)=8x-3, what is the inverse function?

To obtain the inverse fucntion basically all we have to do is re-arrange the equation and the do a small trick of swaping x and f(x), which can be done either at the start or at the end. Assuming we leavce i...
TA
Answered by Teresa A. • Maths tutor
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Cu2+ (aq) reacts with ammonia to form the complex ion [Cu(NH)3)4]2+. Explain this reaction in terms of acid-base theory, and outline the bonding in the complex formed between Cu2+ and NH3

Ammonia acts as the Lewis base in this reaction by donating its lone pair of electrons, whilst Cu2+ (which is an electron deficient, electrophile) accepts the lone pair of electrons from the ammonia, making ...
SZ
Answered by Sophie Z. • Chemistry tutor
84931 Views

Find the integral of 3x^2 + 4x + 9 with respect to x.

We must first remember that to integrate, we must increase the power by 1 and divide by this new power. Therefore, to integrate 3x^2 + 4x + 9, we take the first term, 3x^2 . Using the above method, we find t...
DJ
Answered by Dylan J. • Maths tutor
10144 Views

What is the subjunctive and when do I use it?

Firstly, do not worry! Even in my second year of university I'm still not 100% confident about using the subjunctive. A lot of it is simply instinctive and only becomes obvious after years of exposure to the...
JS
Answered by Jessica S. • French tutor
3052 Views