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First of all let's remind ourselves that the present perfect is used to describe actions or events that have taken place recently or some time ago. It is formed by using the present tense of the verb 'ave...

1 tonne is equal to 1,000kg, so we get 8.5 tonnes ≡8.5×1,000= 8,500kg

While revision is subjective, with successful methods depending on the individual, essay based subjects are widely considered difficult to revise for. Especially during stressful times like exam season. I...

Copper, Zinc, Carbon, Aluminium, Sodium
Copper and Zinc can be extracted from their ores by carbon, as they are less reactive than carbon.

3x(x+2)-7=2 3x²+6x-7=2 3x²+6x-9=0 3(x²+2x-3)=0 [Divide by 3] (x²+2x-3)=0 (x+3)(x-1)=0 x= -3 x=1