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Solve the simultaneous equations (1) 2a - 5b = 11 (2) 3a + 2b = 7

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1
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Answered by Hannah C. • Maths tutor
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A picture is bought at a sale for £40. It is laster sold for £50. What is the percentage profit?

percentage profit = percentage increasepercentage increase = (difference/original) x 100 = (50 - 40)/40) x100=25%
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Answered by Hannah C. • Maths tutor
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How do I express what I think?

You need to use the neutral form and to add at the end of your sentence と思う - とおもうeg. 明日雨が降ると思うNeutral form means that when using- a noun, you need to add だ at the end of the noun eg. それがバッグだと思う- an adjectiv...
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Answered by Victoria T. • Japanese tutor
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Solve the simultaneous equations: 4x+3y=5 and x-y=3, to find the values of x and y.

First of all, we need to get the equations in a form so that either x or y can be eliminated. In this case, I have a positive amount of y, and a negative amount of y, meaning that I can add the two equations...
LP
Answered by Laura P. • Maths tutor
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What is the difference between secondary and tertiary protein structure?

Secondary: localised folding within the polypeptide chain that is stabilised by hydrogen bonds. The most common secondary protein structures are alpha helices and beta sheets. Tertiary: this is the final for...
EW
Answered by Emma W. • Biology tutor
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