book Maths Puzzle Numerical Ability

Simplify: -3√[121]+(-1)^3

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book Other Question

I need help finding the radius and center of a circle with the following equation x squared+ y squared + 4x + 10y + 15 = 0 thanks! Solve each system by graphing
y = -2/3x
2x + 3y = 5

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or inconsistent