- 1/0 is equals to?

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The average aspirin tablet contains 5 grains of acetyl salicylic acid. How many gr of ASA are in a 120-tablet bottle of aspirin? What is the wavelength of a photon (in nm) emitted during a transition from the ni = 5 state to the nf = 2 state in the hydrogen atom? Evaluate the expression: v â‹… w Given the vectors: r = <8, 1, -6>; v = <6, 7, -3>; w = <-7, 5, 2>? Need help with my Math
x^2+25=(x+5)x(x+5)
x=0
Where is the error? Trig questions?