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The perfect tense refers to an action that happened in the past. Eg) I played football. She drank water. We went shopping. In german it is formed using an auxilary verb (haben or sein) and the past partic...

A covalent bond is formed due to a shared pair of electrons between to atoms. It occurs between two non-metal atoms eg) HClAn ionic bond is formed when there is a strong electrostatic attraction between o...

v = f x lambdatherefore lamba = v/ff=1/Tf = 1/0.2 = 5Hzlambda = 20/5 = 4m

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1

percentage profit = percentage increasepercentage increase = (difference/original) x 100                 = (50 - 40)/40) x100=25%