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There are 5 red balls and 7 green balls in a bag. A ball is taken from the bag at random and not replaced. Then a second ball is taken from the bag. What is the probability that the 2 balls are the same colour?

Initially, there are 12 balls in the bag. Therefore the chance of the first ball being red is 5/12 and green is 7/12. The probabilities of the second ball are dependent on the first ball, as it is removed fr...
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Answered by Stanley L. • Maths tutor
12598 Views

What is 90 million in standard form?

1 million = 1,000,00090 million = 90,000,000Place your decimal place after the 9 as standard form only has numbers 1-10 as the first number, otherwise it means this number can be divided by or multiplied 10....
AY
Answered by Abbie Y. • Maths tutor
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Write 32 X 8^(2x) as a power of 2 in terms of x.

Rules of indices question.32 X 8 2x 32 X (8 2 ) x 32 X (8x8) x 32 X 64 x 32 = 2 5 . and 64 = 2 6 2 5 X (2 6 ) x 2 5 X 2 6x (RULE: x a X x b = x a+b )Answer = 2 (6x + 5)
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Answered by Abbie Y. • Maths tutor
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How can I prove that an angle in a semi-circle is always 90 degrees?

If we take the diameter of a circle and create an angle on the circumference at point C of the circle from the two points where the diameter meets the circumference (points A and B), the angle created will a...
DW
Answered by David W. • Maths tutor
5437 Views

Solve the simultaneous equations: 2x+5y=25, x=y+2

using our second equation, we can see that x=y+2. Therefore we can sub x into the first equation. This will give us 2*(y+2)+5y=25. We can go ahead and expand the brackets, which gives us 2y+4+5y=25. We can c...
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Answered by Louis W. • Maths tutor
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