exam Maths Puzzle Numerical Ability

For the input-output matrix A, find the output required to meet the demand D.

A=[0.2|0.4]
[0.3|0.6]


D= [700]
[400]

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exam Other Question

Solve the system by graphing.
3x + y = -1
9x + 3y = -3
State the domain of the following

m(x)= 5/x^2+9