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There are 14 boys in a class and 16 girls. The Mean height of the class is 1.6m, the mean of the girls is 1.5m what is the mean height of the boys?

Mean for all students: (the sum of all the heights)/total number of students = (the sum of boys+sum of girls)/30 = 1.6sum of boys and girls = 1.6 x 30Mean for girls: (the sum of all the girls' heights)/total...
CJ
Answered by Caitlin J. • Maths tutor
5051 Views

How does an action potential travel across a cholergenic synapse?

An action potential arrives at synaptic knob. This causes voltage-gated Ca2+ ion channels to open, resulting in an influx of Ca2+ ions diffusing into the synaptic knob. This then causes vesicles containing a...
VF
Answered by Victoria F. • Biology tutor
2870 Views

Implement a fibonacci function which calculates the nth number of the fibonacci sequence.

def fib(n): if n <= 1: return n else: return(fib(n-1) + fib(n-2)) This is the code for a very basic version. This coud be used to explain how recursion works thanks to a relatively easy example.
AF
Answered by Atom F. • Python tutor
1723 Views

A business is planning to invest in a new machine which will cost £220 000. The machine will lead to an annual increase in revenue of £75 000. It will also lead to extra labour costs of £28 000 per annum but will reduce the firm’s energy costs by £4 000

Annual return is £75 000 – £28 000 + £4 000 = £51 000 Return on investment = annual return x 100 = £51 000 x 100 = initial cost £220 000 Answer = 23.2% or 23%
DS
3527 Views

(a) Express x +4x+7 in the form (x+ p) +q , where p and q are integers.

(x + 2) 2 +3
DS
Answered by Dylan S. • Maths tutor
4777 Views