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3 green balls, 4 blue balls are in a bag. A ball is removed and then replaced 10 times. What is the probability that exactly 3 green balls will be removed?

(Binomial)P(G=3) : (₁₀C₃)(3/7)³(4/7)⁷

Answered by • Maths tutor

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Evaluate gf(-5) for the functions f(x)=3x+7, g(x)=3x^2+6x-9

I like to think of gf(-5) as g ( f(-5) ), which helps visualise the order in which you need to calculate the output for each function. First you need to find the answer for f(-5), which you then use as t...

Answered by • Maths tutor

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Factorise the expression given

2x²-2x+4
=2x²+2x-4x+4
=2x(x+1)-4(x+1)
=(x+1)(2x-4)

Answered by Rachael H. • Maths tutor

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Outline a cognitive approaches to explaining depression, with reference to who founded it and examples to explore their ideas.

Beck's negative triad focuses on negative schemas, maladaptive frameworks of understanding, that create cognitive biases which then lead to feeling of depression and lack of control. The triad includes bi...

Answered by • Psychology tutor

2284 Views

A curve has equation y = x^3 - 48x. The point A on the curve has x coordinate -4. Is A a stationary point?

A stationary point indicates that the gradient at that coordinate is 0. Hence we need to find the gradient of the line, set this to 0, and then substitute our value of x. Find dy/dx. Remember the equation...

Answered by Oliver H. • Maths tutor

5099 Views