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There are only red , blue and purple counters in a bag. The ratio of the number of red counters to the number of blue counters is 3 : 17. If a counter is taken randomly the probability that it is purple is 0.2 Work out the probability for it to be red.

I would first take into account all the variables - there are red, blue and purple counters, we know the ratio of red to blue and we know the probability of purple is 0.2.
As I know the probability t...

Answered by George W. • Maths tutor

15285 Views

Describe how water, ions and sugar are obtained and transported through plants.

Water
Water is obtained from the soil into the roots of the plant. This occurs via osmosis, which is the movement of high water potential to low water potent...

Answered by Olivia H. • Biology tutor

6456 Views

The curve C is given by the equation x^4 + x^2y + y^2 = 13. Find the value of dy/dx at the point (-1,3). (A-level)

The most important thing to note about this question is that we must differentiate implicitly. We must differentiate each term with respect to x. Using our differentiation rules we can see that our first ...

Answered by Riya K. • Further Mathematics tutor

2756 Views

How many atoms are there in 0.75 mol of water? Give answer to 2 decimal places

Number of particles of water = avogadro constant x amount in molTherefore6.02 x10²³ x 0.75= 4.515 x10²³There are 3 atoms in every molecule of water so we need to multiply the number ...

Answered by Alicia R. • Chemistry tutor

3203 Views

What is the significance of the number e (Euler's number)?

The irrational number e is one of the most important numbers in mathematics. The value of it is 2.718... but since it is irrational that is e to 4 significant figure, only. How can we calculate this numbe...

Answered by Soleiman A. • Maths tutor

4175 Views