exam Maths Puzzle Numerical Ability

Find all real and imaginary solutions to the equation.

b^4+13b^2+36=0

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exam Other Question

Can someone help me solve this problem?

Subtract:

8 gal. 7 qt.
- 3 gal. 2 qt.

Thanks,
Sher find the equation of a line for this points (6,2) and is parallel to the line 2x-3y=-3