exam Maths Puzzle Numerical Ability

The sum of a number and -16 is 3. Find the number.

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exam Other Question

Can someone help with these problems?

z+u/zu^2+4z+u/z^2u

7w-42/6w


y/7-7/y=0
hello

how do you figure the slope of any line that is perpendicular to the line through

(-3, 5) and (4,-6)

Tks!