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Solve 5x - 6 = 3x + 7

Rearrange the equation so that both x's are on the same side of the equation, making sure that you change the sign of the number you bring across: 5x - 3x = 7 + 6 Now simplify: 2x = 13 Divide by 2: x = 13/2
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Answered by Helena W. • Maths tutor
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If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

The key is start out by working out the number of widgets per minute that a single machine makes. If it takes five minutes for five machines to produce five widgets then, on average, it takes five machines 1...
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Answered by Hamza A. • Maths tutor
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Describe competitive and non-competitive inhibition of enzyme action.

To start with, let’s just quickly define an enzyme. An enzyme is a biological molecule that is able to speed up a reaction. Without the presence of enzymes, certain reactions just wouldn’t be able to take pl...
RS
Answered by Rowan S. • Biology tutor
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How can I calculate the value of a number raised to the power of a fraction, e.g., 9^(3/2)?

In order to calculate the value of a number raised to the power of a fraction, you first find the root of the number according to the value of the denominator (bottom number of the fraction). In the example ...
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Answered by Elsa A. • Maths tutor
13017 Views

Explain the Theory of Natural Selection

There are four key points to natural selection: first, that individuals in all species show variation second, that this variation is genetic and therefore heritable third, that certain characteristics give t...
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Answered by Josie W. • Biology tutor
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