exam Maths Puzzle Numerical Ability

Simplify the following expression. (-xt^2)(-2x^2t)^4

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exam Other Question

Travelers have reset their watches only when the time change equals 1.0h. How far on the average must you travel in degrees of longitude until your watch must be reset by 8 hours? i am stumped as to how to solve this problem. using the rational zero theorem to find the possible zeros of: p(x)= 2x^3-5x^2+2x-9. thank you so much!!