Answer:
z = 5
Step-by-step explanation:
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Answer:

Step-by-step explanation:
Quadratic Formula: 
√-1 is imaginary number i
Step 1: Define
y = -3x² + 4.5x - 20
a = -3
b = 4.5
c = -20
Step 2: Substitute and Evaluate







This is 1/2 to 1/10
multiply each fraction by 10:-
= 5 : 1
The answer is 5 Choice D