- Is 2 the hcf of 18 and 42?

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Whats the conjugate base of NO2-? What is the acceleration of a proton moving with speed of 7.5m/s at right angle to a magnetic field of 1.4T? If f(x)=x^2-1 and h(x)=4x+3, then f(h(2))=? Find the length of the curve over the given interval.
polar equation
r = 4a cos(θ) interval
-pi/2 <= theta <= pi/2? Can Some Mutations Be Adventageous And Some Deleterious In Differentv Environments?