Which equation is equivalent

(4x^2 +9) (4x^2 -9) =0

Step-by-step explanation:

16x^4 - 81 =0

Rewriting

(4x^2) ^2 - 9^2 =0

This is the difference of squares a^2 -b^2 = (a+b)(a-b)

(4x^2 +9) (4x^2 -9)=0

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

12cm

the answer is d