exam Maths Puzzle Numerical Ability

Evaluate is possible:

sgrt -121

Is this an equation that can be evaluated?

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exam Other Question

Solve using addition and multiplication principals.

5 + 4x < 21
The solution set is {x/x ??}

Solve the following system of equation

x + 4y = 2 (1)
x = 7 -4y (2)
What is the soltution of the system? Can you please help me solve this problem: A manufacturer sells a product at $8 per unit, selling all that is produced. Fixed cost is $5000 and variable cost per unit is 22/9 dolla