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So since there are two unknowns in this question, its slightly more difficult than a normal equation where we only have 1 x or y that we're trying to work out. There are two ways to deal with this type of...

W:B = 2:5 Total of 21 litres of paint. We want a ratio of W:B = 1:4 = 2:8
Therefore we must add 3 parts of blue paint
2 + 5 = 7 parts total7 parts = 21L1 part = 3L3 parts = 9L
Ther...

so we need to know the understanding of BODMAS, hoe to add fractions, how to multiply fractions, how to simplify fractions.Answer:9/7

i) We must differentiate the equation and set it equal to 0 to find stationery points:
dy/dx = 3x² + 6x + 24=0 Note we can take out a factor of 3 x²+ 2x - 8=0 Fact...