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Describe two's complement.

Two's complement is improvement on one's complement. To get a negative number in One's complement, one has to invert all numbers (turn 1 to 0, and 0 to 1), for two's complement is the same but add 1 (e.g. in...
LP
Answered by Lukas P. • Computing tutor
2348 Views

Solve t^2-t=3(7+t)

Expand RHS: t 2 - t = 21+ 3tCollect all terms on one side: t 2 - 4t - 21 = 0Factorise and solve by inspection / use the quadratic formula to solve for t: (t + 3)(t - 7) = 0 / t = [ -(-4) ± ( (-4) 2 - 4x(1)x(...
CW
Answered by Charlie W. • Maths tutor
3734 Views

Find the exact value of dy/dx at (-2,4) of the curve C: 4x^2 -y^2 + 6xy + 2^y = 0

First notice that this is an equation that will require implicit differentiation since C cannot be explicitly written in terms of either x or y. Thus we must differentiate each term with respect to x:-the fi...
SD
Answered by Saskia D. • Maths tutor
5017 Views

Suggest which particles will be emitted as K-40 decays to Ca-39:

As the proton number increases by 1 from 19(K) to 20(Ca), the process of decay must be beta minus in order to conserve charge. This means that an electron (or beta plus particle) will be emitted along with a...
LA
Answered by Luke A. • Physics tutor
2298 Views

What is a case study and why might a psychologist choose to use this research method?

A case study is an in-depth analysis of the experience of an individual or small group. A psychologist might opt for the case study method if they are interested in individuals with very unusual and understu...
RP
Answered by Roisin P. • Psychology tutor
6324 Views