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There are n sweets in a bag, 6 of which are red. The rest of the sweets are blue. Jen removes 1 sweet from the bag. Jen then takes another sweet from the bag. The probability that Hannah takes two red sweets is 1/3. Show that n²-n-90=0.

We know the total number of sweets is n, and that 6 are red. When Jen takes the first sweet, the probability of it being red is [number of red sweets] / [how many there are] = 6/n . For the second sweet, the...
AB
Answered by Amy B. • Maths tutor
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How do I analyse Shakespeare’s language?

When analysing Shakespeare, don’t panic if you don’t understand every word; focus instead on the overall meaning of the text. Ask yourself: What is Shakespeare trying to achieve here? Has he written this pas...
KC
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What does it mean to 'earth' something?

When you earth a charged object you're creating a physical path between this object and the ground so it loses its charge. To begin with the object is charged due to having extra or fewer free electrons. Whe...
RJ
Answered by Rhiannon J. • Physics tutor
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Lewis wins £360 in a prize draw. He gives 15% to charity and puts 3/8 into his savings. The rest he uses to buy a bike. How much of the money has Lewis got left for this bike? Note: do not use a calculator

10% of £360 is £36. Therefore 5% of £360 would be £18 (half of the 10% figure). Added together, 15% of £360 would be £54. 1/8 of £360 is £45 (half £360 three times), therefore 3/8 would be £135 (£45*3). £54 ...
LB
Answered by Lewis B. • Maths tutor
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Can I use diagrams in my answers?

Yes, if a diagram is relevant, always use them. For example if you are answering a questions of the different types of tectonic plate boundaries it would be helpful to sketch and briefly label each one to he...
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Answered by Alice D. • Geography tutor
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