Find the value of which will make the quadratic expression 9y²-12y+k is a perfect square
a) 5
b) -4
c) 4
d) 9

The value of k must be[c] to make this quadratic equation a perfect square.

Step-by-step explanation:

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c)4

Step-by-step explanation:

9y²-12y+k

(3y)²-2*3*2*y+2²=(3y-2)²

k=2²=4

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg

answer: 12   they all have at least 28 days

step-by-step explanation: haha