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What is the difference between sedimentary, igneous and metamorphic rocks?

Sedimentary rocks are those that are formed by the weathering or breaking down of pre-existing rocks that then get laid down and lithified in layers such as sandstone. Igneous rocks are formed by tectonic pr...
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Answered by Lauren R. • Geology tutor
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The equation of line 1 is y=3x-2 and the equation of line 2 is 3y-9x+5=0. Show the two lines are parallel.

The two lines are parallel if they have the same gradient, so for a line in the form y=mx+c, m of the two lines must be the same.Line 1 is already in this form so we need to rearrange line 2 to be in this fo...
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Answered by Emma S. • Maths tutor
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85 cm^3 of 0.05 mol/dm^3 sulfuric acid is used to neutralise 15 cm^3 of sodium hydroxide of an unknown concentration. Given that the chemical formula of the reaction is 2NaOH + H2SO4 => NA2SO4 + 2H2O, find the concentration of the sodium hydroxide.

Firstly, calculate the number of moles of sulfuric acid that reacts with the sodium hydroxide, using the equation; n = MV/1000 , where n is the number of moles, M is the concentration (in mol/dm 3 ), and V i...
JN
Answered by Joshua N. • Chemistry tutor
4313 Views

Find the equation of a straight line that passes through the points (2,7) and (5,3)

Since we're told the line is straight, the equation of the line will be of the form y = mx + c.The gradient of the line, m, is the change in y divided by the change in x ; m = (3-7)/(5-2) = - 4/3.Therefore, ...
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Answered by Joshua N. • Maths tutor
4143 Views

write x^2 + 10x - 6 in the form (x+a)^2 + b

(x + 5) 2 - 5 2 - 6(x + 5) 2 - 25 - 6(x + 5) 2 - 31
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Answered by Thomas B. • Maths tutor
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