exam Maths Puzzle Numerical Ability

-4t - 2(7 - 3t)= -3t + 23 i can;t figure this out

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exam Other Question

Solve the system of linear equations by the substitution method. Then, state whether the system is independent, dependent, or inconsistent.
-x+7y=4
-x+7y=3 write an equation to solve this problem. the service pool built a pool that was 100ft by 60ft wide. they want to built a sidewalk around the pool and had 450ft of fence. what is the maximum width that the sidewalk can be?