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There are 20 balls in a bag. The probability is 0.25 of picking a red ball. If one more red ball is added, what is the new probability of picking a red ball at random?

Convert 0.25 into a fraction where 20 is the denominator as there are 20 balls in total in the bag. 0.25 is the same as 1/4 and to convert this to 20 as the denominator multiply both the top and the bottom b...
AL
Answered by Alex L. • Maths tutor
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Comment on the theme of revenge in Shakespeare’s Hamlet

Revenge tragedies were popular in Elizabethan theatre for their violent action and on-stage spectacle of bloody justice. Hamlet uses a medieval Danish revenge story as a framework to comment on the internal ...
KM
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The area of a square is 49cm^2. The perimeter of the square is equal to the circumference of a circle. what is the radius of the circle?

This is a geometry question. We know that a square has 4 equal sides of x, and that it's area is given by A=x 2 . So we can work out the length of the side of the square. x=sqrt(49) = 7 We are told this is e...
JC
Answered by Julia C. • Maths tutor
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Solve these simultaneous equations: y=3x-10; y=2x+5

Method 1 (algebraically): Since we have "y=" at the start of both equations, we can substitue one into the other to get 3x-10=2x+5 Then we want all the x terms on one side of the equation, and all ...
CW
Answered by Catherine W. • Maths tutor
11247 Views

What is a nephron?

Nephrons are units of the kidney which are specially adapted for filtration and reabsorption of substances in the blood. Each nephron is composed of different various parts which have specific roles. These p...
LH
Answered by Laetitia H. • Biology tutor
7783 Views