exam Maths Puzzle Numerical Ability

a right triangle has hypotenuse with a measure of 20 cm and a perimeter of 47cm. find the measure of the remaining sides.

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exam Other Question

A measuring tape drops from a roof that is 16 feet above the ground. After how many seconds does the measuring tape land on the ground?

How would you write the equation? PLEAS HELP TO ADD GROUPING SYMBOLS TO THIS EXPRESSION TO COME OUT TO 279,936-THANKS 2*3^3+4