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Explain the meaning of reciprocity in regards to caregiver-infant interactions. (2 marks)

Reciprocity refers to a two-way interction between the caregiver and baby, where they take turns in responding to each other. The interaction is sustained as they continuously elicit responses from each other.
YB
Answered by Yinka B. • Psychology tutor
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Show that if a^n - 1 is prime then a = 2. If n is not prime, can 2^n-1 be prime?

This question is based on MAT 2015 question 2. This question has already built up the generalized difference of two powers in the buildup. We can apply this to a n - 1 to give: a n - 1 = (a - 1)(a n-1 + a n-...
MW
Answered by Mark W. • MAT tutor
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How would you go about calculating inflation using CPI (consumer price index)

- The consumer price index is the official measure of inflation in the UK - 2 surveys are conducted. The first survey is the Living Costs and Food surveys which involves approx. 7000 households completing se...
Answered by • Economics tutor
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b is two thirds of c. 5a = 4c Work out the ratio a : b : c Give your answer in its simplest form where a, b and c are integers

a : c = 4 : 5 and b : c = 2 : 3 so getting a common value of 15 for B gives a : c = 12 : 15 and b : c = 10 : 15 we can now compare these ratios and get 12 : 10 : 15 this is not divisible by any common factor...
JC
Answered by jamie c. • Maths tutor
8982 Views

What is the chain rule?

Up until now you may have been given functions like f(x)= 7x^3 +cos(x) and been told just to differentiate. What your teacher really meant was to differentiate with respect to x. The chain rule allows us to ...
JM
Answered by James M. • Maths tutor
3627 Views