exam Maths Puzzle Numerical Ability

Two pipes are used to fill a water storage tank. The first pipe can fill the tank in 4 hours, and the two pipes together can fill the tank in 2 hours less time than the second pipe alone. How long would it take for the second pipe to fill the tank?

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exam Other Question
Graph the quadratic equation after completing the given table of values.
y = –x2 + 1
x y
–2 -3
–1 0
0 1
1 2
2 5 Hello, and thanks for your help in advance.

Simplify (6x^-3y^5)^2z^0

Write answer without using negative exponents.

Thanks!