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Add the brackets to make the sum correct for the following equation: 12-11+2-1= 0

By putting the bracket around (11+2-1) you are able to calculate that this then equals 12. This can the be put into the equation 12-(11+2-1)=0 which is 12-(12)=0. This then means that 12-12=0 giving you the ...
JW
Answered by Jessica W. • Maths tutor
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Factorise the following equation fully: 2x^2+12x

Firstly, we need to take a factor of 2x out of the equation. This is because both 2x 2 and 12x can be divided by 2x. This gives us (2x)(x)+(2x)(6). If we then collect the terms 2x, we get 2x(x+6). 2x(x+6) is...
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Answered by Jessica W. • Maths tutor
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Explain the function of the heart

The heart functions as a pump, circulating blood around the body to the cells. This is the medium for oxygen being delivered to the cells. The heart has two sides, left and right. Each one contains a ventric...
JC
Answered by Jacob C. • Biology tutor
2586 Views

Explain, using an example, what is meant by 'opportunity cost'?

Opportunity cost is defined as the next best alternative forgone. This is essentially, all the other alternatives that have to be given up when you make a choice. For example, the opportunity cost of going t...
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Answered by Jessica W. • Economics tutor
4216 Views

Find the equation of the tangent to the curve y = exp(x) at the point ( a, exp(a) ). Deduce the equation of the tangent to the curve which passes through the point (0,1) .

The tangent to the curve is a straight line and will hence have the form f(x) = m * x + c, where m is the gradient of the tangent line and c is the y-intercept of the tangent line. The gradient of the tangen...
CT
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