- Maths question. Why is the answer A? Why not D?

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How many moles of ions are in a solution of 7.4 moles FeCI3 in 500 mL water? I need news on the tremors/aftershocks/earthquake I am feeling in Maricopa county Arizona.? What is the purpose of blanching foods? Which pattern of speciation is most important in nature? Allopatric or sympatric why? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)?