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3 teas and 2 coffees have a total cost of £7.80 5 teas and 4 coffees have a total cost of £14.20 Work out the cost of one tea and the cost of one coffee.

3t + 2c = 7.80 ---> x2 to get 6t + 4c = 15.605t + 4c = 14.20 6t + 4c = 15.60-- 5t + 4c = 14.20= 1t = 1.40If t = 1.40 substitute t in to the equation to get:(3 x 1.40) + 2c = 7.80 ---> 2c = 3.60 --> ...
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Answered by Hania K. • Maths tutor
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How does an increase in concentration affect the rate of reaction

An increase in concentration increases the rate of reaction because there are more particles in the same volume . This means that there as increase in the frequency of collisions.
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Answered by Hania K. • Chemistry tutor
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How is the blood sugar concentration maintained in the body?

The main organ controlling blood sugar levels is the pancreas. This is both an exocrine and endocrine gland. The endocrine part of the gland is what helps control blood glucose at a healthy level through the...
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Answered by Fatima R. • Biology tutor
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Write a function s(n) that will return a list of the first n squares.

def s(n): ans=[] #This variable stores the list we will return. for i in range(n): #This is a for loop that will iterate n times. ans.append((i+1)**2) #This adds the (i+1)th square to the list, because range...
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Answered by Brodie M. • Python tutor
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Solve the following equation: x^2 - 5x - 14 = 0

The equation above is an example of a quadratic. The easiest way of solving this is to split the equation into two brackets, allowing you to equal each individual bracket to zero, and so get a value of x. A ...
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Answered by Noah N. • Maths tutor
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