book
Maths Puzzle
Numerical Ability
How do I first simplify then solve:
-1/9u^-5*(45u^-4)
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book Other Question
The worksheet says:
Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions.
The problem:
3x-y=4
2x-3y=-9
explain how you would decide whether the product of three numbers is positive or negative