- How many elements are there in lanthanides?

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Composition of functions question and please explain with answer? What is the economic life span of water cooled medium sized chillers for office use 5 days a week operating hours 8:00 AM to 5:00PM? What is the pH of a 0.210 M aqueous solution of potassium nitrite, KNO2? pH =? Write each as a single mixed number (with the fraction being proper): a) 2 5/84 + 5 27/28
b) 1 3/5 − 4 2/3
c) 2 1/2 × 1/2
d) 3 9/17 ÷ 3/17? F(x) = sin^2x show that 1-f(X) = (90deg-x)?