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There are 5 girls, 6 boys and some adults in a classroom. The probability that a girl is chosen is 1/3. What is the probability of an adult being chosen?

This is a question taken straight out of an Edexcel exam paper. I think it's a good test of GCSE level probability and algebra. We don't know how many adults there are to begin with so let's say n = number o...
JM
Answered by Jack M. • Maths tutor
10198 Views

John is n years old where n is an whole number. Kim is three years younger than John and Vanessa is half of Kim's age. Write an expression for Vanessa's age in terms of n.

Just to make things easier to write I will be using some letters to mean things.I will write:J = John's ageK = Kim's ageV = Vanessa's age.So John is n years old so John's age is n --> J = n. Kim is three ...
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Answered by Jack M. • Maths tutor
5248 Views

What is the remainder when you divide 2x^3+7x^2-4x+7 by x^2+2x-1?

Before we answer the question let's compare the method taught for polynomial long divison to regular long division.If we wanted to find the remainder of 71 when divided by 3, we would find the nearest whole ...
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Answered by Jack M. • Maths tutor
4648 Views

What are the different types of RNA used for during translation?

Translation occurs at the ribosomes (which may be attached to endoplasmic reticulum). The ribosomes themselves are made of rRNA.mRNA carries the code for the polypeptide as it is complimentary to a strand of...
RM
Answered by Roshni M. • Biology tutor
2952 Views

Describe the process of oxidative phosphorylation.

Student answer will be structured as a paragraph, or bullet point sentences, including at least five (but not restricted to) of the following points: hydrogens from reduced hydrogen carriers (FADH/NADH); hyd...
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Answered by Josephine B. • Biology tutor
4261 Views