V² = u² + 2as
u = 12 a = -6 s = 9
work out a value of v

v=6

Step-by-step explanation:

v²=12²+2×-6×9

v²=144-108

√v²=√36

v=6

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c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.