- Solve this equation 4x + 15 =13?

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Similarities between bird and human skeleton? Q1: In a right-angled triangle, one acute angle is Calculate the moles of Fe2+(aq) present when 74.5 mL of 2.00 M Fe2+(aq) are diluted to a total volume of 100.00 mL.? How do I solve 8 sec2 x + 4 tan2 x − 12 = 0? If He(g) has an average kinetic energy of 8990 J/mol under certain conditions, what is the root mean square speed of Cl2(g) molecules?