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Washing powder is sold in two sizes: Bag 1 is 600 grams for £3.30. Bag 2 is 1500 grams and usually costs £9.60 but currently has 15% off. Which is better value?

To determine which is better value, we need to determine the price per gram of each washing powder. Bag 1: For the 600g bag, this is done by dividing the price by the number of grams: 3.30/600 = £0.0055/g or...
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Answered by Joe L. • Maths tutor
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Describe the characteristics of oceanic crust. (AQA Past Paper, 3 marks)

There are two types of crust we need to know about: Oceanic crust and Continental crust. Oceanic crust is formed at mid ocean ridges where two plates pull apart. Here magma from the mantle upwells. When it r...
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Answered by Katie G. • Geography tutor
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Where do electrons go in an atom?

Electrons are spread around the atom, in layers outside of the nucleus (which holds the protons and the neutrons). These layers are called shells. The innermost shell can only hold 2 electrons, the other she...
KB
Answered by Kathryn B. • Chemistry tutor
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What is the difference between an alkane and and alkene

An alkane is a chain of carbons connected together by single bonds (-C-C-C-C-C-). All carbons have to have 4 bonds, so the carbons in the middle of the chain are attached to two other carbons, and two other ...
KB
Answered by Kathryn B. • Chemistry tutor
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At what points does the line y = x +1 intersect the circle x^2 + y^2 + 18x + 20y + 81 = 0.

The method we shall use is substitution. We shall replace y each term by 'x + 1' so we are able to obtain an equation in one variable. x^2 + (x+1)^2 + 18x + 20(x+1) + 81 = 0. We now expand the brackets. x^2 ...
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Answered by Harry R. • Maths tutor
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