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How do you calculate efficiency?

The efficiency is calculated using the equation: ((Total useful output energy)/(Total input energy)) *100 We are essentially trying to calculate what percentage of the input energy is converted into a useful...
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Answered by Rachel M. • Physics tutor
2688 Views

Calculate 27^(-3/2)

The question asks you to calculate 27 -3/2 . Due to the presence of the negative sign, 27 -3/2 is the same as 1/27 3/2 . The fractional power is a little more tricky. The denominator, 2, means that the numbe...
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Answered by Rachel M. • Maths tutor
5345 Views

Expand the following expression: (2x+3)(x+1)

In order to answer this question, we will follow the FOIL procedure. First, Outter, Inner, Last. Using the 'F' we will multiply the first 2 numbers of each bracket. In most cases, these 2 variables will have...
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Answered by Namrata H. • Maths tutor
4902 Views

Solve simultaneously 2x+3y=8, 3x+2y=7 to calculate values of x and y.

First of all, we must multiply each equation by a suitable number in order to get the same leading coefficient. In simple terms, we must make the coefficient of the x or the y in both equations the same. So ...
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Answered by Vasant L. • Maths tutor
7494 Views

Explain the lock and key hypothesis of chemical reactions.

The lock and key hypothesis explains how each enzyme acts specifically on a certain substrate. The lock is the enzyme. The key is the substrate. The lock has a site where a specific substrate binds called th...
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Answered by Charlotte H. • Biology tutor
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