exam Maths Puzzle Numerical Ability

another problem!
find the third term in the expansion of (3t+4)^8 choices are: 48t^6, 11,644t^6, 326,592t^6 or 448t^6 really confused

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exam Other Question

Write the quadratic function that has a vertex at (-1,3) and a y-intercept of -4. I think the answer is y=-(x+1)^2-3. How can I solve 13 times the square root of 5 minus the square root of 10 when it has to be multiplied by 3 times the square root of 2 plus 4 times the square root of 5 and this pa