exam Maths Puzzle Numerical Ability

Simplify

-3i^2 + 4i - 5 times the square root of -9 - 4 + 5i^3

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exam Other Question

can you please check this for me? I have to solve by using the quadratic formula.

5x^2+x+10=0
a=5
b=1
c=10
b^2-4ac=1^2-4*5*10=-199
-199 is less than 0 so no solution is defined Diluting wine.
A restuarant manager has 2 liters of white wine that is 12% alcohol. How many liters of white grape juice should be added to get a drink that is 10 % alcohol?