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How do I know where to start with my reading/work?

It is useful to use the lecture slides/reading list a guide to focus you reading and learning for Geography at University.I would recommend starting with a topic you find particularly interesting then readin...
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Answered by Lucy H. • Geography tutor
1498 Views

Simplify, leaving your answer as a quadratic: (2x + 3)/(x+4) - (3x - 6) = 4

(2x + 3)/(x+4) - (3x - 6) = 4 Initial equationTimes all terms by (x + 4) (2x + 3) - (3x - 6)(x + 4) = 4 (x + 4)Multiply out the brackets (2x + 3) - (3x 2 + 12x - 6x - 24) = 4x + 16Remove from brackets by fac...
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Answered by Anya O. • Maths tutor
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A quarter circle has a radius of 6 cm. Calculate the area of the quarter circle.

It is very easy to calculate the area of the whole circle and divide it by 4.The area of the whole circle can be calculated using the formula A = pi r 2 , where r is the radius of the circle and pi has a val...
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Answered by Ana D. • Maths tutor
10328 Views

The molecular formula of TCDD is C12H4O2Cl4. Chlorine exists as two isotopes 35Cl (75%) and 37Cl (25%). How many molecular ion peaks are there? What is the mass of the most abundant one?

Because chlorine exists as two isotopes, two molecular ions will be present, and their relative heights will correspond to the abundances of the isotopes. The tallest peak will be 3 times the height of the s...
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Answered by Ana D. • Chemistry tutor
7683 Views

What is the mass percentage of carbon in a CO2 molecule?

First we need to calculate the total mass of a CO 2 molecule. This is done by summing up the individual masses of all the atoms. To find these, we look at the periodic table and see that the masses are C: 12...
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Answered by Ana D. • Chemistry tutor
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