exam Maths Puzzle Numerical Ability

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

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exam Other Question

Write the decimal number 0.394 as a fraction and simplify.( show your work)
Thank you. A boat can go 33 mph in still water. It takes as long to go 300 miles upstream as it does to go downstream 360 miles. How fast is the current?

Will someone please explain this to me?