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A is the point with coordinates (5, 9) B is the point with coordinates (d, 15). The gradient of the line AB is 3. Work out the value of d.

gradient is calculated using the change in y coordinates divided by change in x coordinates. so, (15-9)/(d-5)=3 => 6/(d-5)= 3rearrange this equation to get d on one side (6/3)+5 = d therefore d= 7

Answered by Eve C. • Maths tutor

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What is the difference between the imperfect and the perfect tense?

Spoken french uses different kinds of tenses to talk about the past. The main two which are used are the imperfect (l'imparfait) and the perfect (le passé composé). The imperfect tense, w...

Answered by Alice P. • French tutor

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propene and steam react to form propan-2-ol. If the yield is 75% what mass of propene is required to produce 410g of propane-2-ol. [molar masses/gmol-1 propene=42, propan-2-ol =60]

remember the equation moles = mass/molar mass. We have the final grams of product and also the molar mass so we can calculate the number of moles we got from this. [410/60=6.83moles]

Answered by Jasmine W. • Chemistry tutor

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Functions question: f(x) = 3x + 2a; g(x) = ax + 6; fg(x) = 12x + b. a and b are constants; Work out the value of b

So this is a functions question which is essentially asking you to combine the first two functions and then equate them with the last one.
fg(x) can be considered as replacing the x in f(x) with g(x)...

Answered by Ritik P. • Maths tutor

3556 Views

Explain how an individual develops immunity following infection by a bacteria

When an individual is exposed to the bacterial pathogen and its antigen, it causes activation of the body's own immune response. When the immune response is initiated, the pathogens are destroyed by T kil...

Answered by Kathryn M. • Biology tutor

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