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Convert 0.22222222... (recurring) into a fraction

x=0.22222222...10x= 2.222222...10x-x=9x=2x=2/9=0.2222222... x=2/9
RG
Answered by Rachel G. • Maths tutor
12861 Views

Solve the equation log2(x + 3) + log2(x - 3) = 4

log2(x + 3) + log2(x - 3) = 4log2 [(x + 3)(x - 3)] = 4x^2 - 9 = 16x^2 = 25x = 5
Answered by • Maths tutor
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Work out the gradient and y-intercept of the straight line with points A(3,8) and B(-2,-7)

Y= mx + cFinding m : change in y/ change in x => (8--7)/(3--2) = 3Finding c : input a pair of coordinates => 8 = (3 x 3) + c .... c = -1y = 3x -1
KR
Answered by Kim R. • Maths tutor
3111 Views

What are the conditions for an event to be modeled with the binomial distribution?

The event should be; mutually exclusive from the other outcome, independent from the other outcome (so its probability doesn't change ) and happen within a fixed number of trials . A good example would be th...
RK
Answered by Roy K. • Maths tutor
3495 Views

Why does a 'many to one' function not have an inverse?

Because its hypothetical inverse would be 'one to many' which is not a function. This is because a single x-value would map to several y-values at the same time.
RK
Answered by Roy K. • Maths tutor
18672 Views