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Simplify: 5x + 8y - 3x + 9y

When you first come across algebra, it may be a bit tricky to get your head around as it involves more abstract concepts than we may have previously seen in maths. However, once you understand the basic prin...
KS
Answered by Katharine S. • Maths tutor
4174 Views

Describe the course of blood through the heart and lungs, explaining how it becomes oxygenated.

Considering the heart has 4 distinct chambers - for this question it's best to start in the right atrium. (Supported by a diagram) Deoxygenated blood is returned to the right atrium from the rest of the body...
LR
Answered by Liam R. • Biology tutor
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Complete and balance the equation: Mg(OH)2 + HCl -> ??

This relies on the knowledge that an acid + base --> salt + water.Once you have realised this - pick out the acid and the base (remember acids have H+ and bases OH-)Now, you know that water will be made -...
SA
Answered by Sophie A. • Chemistry tutor
4993 Views

Write sqrt(75) in simplified surd form.

First you want to find a square number that is a factor of 75. In this case it is 25, as 25 x 3 = 75 . With this information you can expand the surd into:sqrt(25) x sqrt(3) As 5^2 = 25, this can become:5 x s...
KG
Answered by Kate G. • Maths tutor
7567 Views

Here are three expressions. b/a, a – b, and ab. When a = 2 and b = -6, which expression has the smallest value?

b/a = -6 / 2 = -3 ......... a - b = 2 - (-6) = 8 ............ ab = 2 x -6 = -12 ...............Therefore ab , -12, has the smallest value.
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Answered by Tara M. • Maths tutor
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