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Peter is 180cm tall, correct to 2 significant figures. Alice is 150cm tall, correct to 2 significant figures. What is the upper and lower bound of the difference in their heights?

Upper bound of Peter's height = 185cmLower bound of Peter's height = 175cmUpper bound of Alice's height = 155cmLower bound of Alice's height = 145cmFor the upper bound of the difference, we want the upper bo...
JT
Answered by James T. • Maths tutor
4087 Views

Use de Moivre's theorem to calculate an expression for sin(5x) in terms of sin(x) only.

de Moivre's theorem gives us that (cos(x) + i sin(x)) n = cos(nx) + i sin(nx), for integers n and real values x.Therefore cos(5x) + i sin(5x) = (cos(x) + i sin(x)) 5 = cos 5 (x) + 5i cos 4 (x)sin(x) - 10 cos...
CB
38688 Views

What’s the best way to learn my set texts?

There are many different options for learning your set-texts. You need to learn them inside out and at the same time you want to do this as quickly as possible so it is vital to have the right approach. Here...
RH
2570 Views

How does Latin’s ‘sequence of tense’ rule work and why do I need to understand it?

In Latin, tenses are divided into two sets, or sequences: primary and historic. The main primary tenses are the future (I will verb ), the present (I am verbing ) and the continuous perfect (I have verbed )....
RH
Answered by Rod H. • Latin tutor
11564 Views

Explain the difference between diffusion and active transport with examples.

Diffusion is the passive process by which molecules move across a semi permeable membrane down their concentration gradient from an area of high concentration to low concentration. An example is gaseous exch...
SM
Answered by Sarah M. • Biology tutor
9353 Views