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Hannah's sweet problem (Edexcel 2015): There are n sweets, 6 are orange, rest of the sweets are yellow. She takes 2 sweets randomly without replacing them and the probability that 2 orange sweets are chosen is 1/3. Show that n^2-n-90 = 0.

Draw a probability tree diagram. For this question, only two branches are required (orange and orange). At the start, there are n sweets in total, 6 are orange, so p(O) = 6/n. On our second pick, there are 5...
YZ
Answered by Yimin Z. • Maths tutor
5679 Views

Karen got 32 out of 80 in a maths test. She got 38% in an English test. Karen wants to know if she got a higher percentage in maths or in English. Did Karen get a higher percentage in maths or in English?

We are given that Karen got 38% in her English test, so all that's left to do is work out the percentage she achieved in her maths test and then compare it with 38%: We calculate the percentage by taking 32/...
HC
Answered by Hal C. • Maths tutor
8350 Views

Describe how different environmental factors affect the direction of growth of roots and shoots.

The growth and roots and shoots is caused by the plant hormone auxin. Shoots grow towards light, known as phototropism, they also grow upwards against the force of gravity which is known as geotropism. In sh...
AO
Answered by Andrew O. • Biology tutor
3398 Views

What is an agreement ?

An agreement is the change made to a past participle verb or adjective to correspond, or "agree", with the noun in question. These agreements could represent plurals or genders. For instance, for m...
LM
Answered by Lara M. • Italian tutor
2984 Views

Explain the Marketing Mix

The Marketing Mix is a set of marketing tools utilised by businesses to fully comprehend what their products or services can bring to the market, whilst also enabling them to develop a successful strategy to...
MA
3341 Views