Responda essas 4 contas com o calculo que dou 5 estrelas e marco como melhor resposta (Pfv é pra esse fim de semana) (- 4/3) : ( - ½) =
( -4,0) : ( 1/5) =
( ¾) . (3/4 ) + ( ( 2/3) . (2/3) . (2/3) ) = -2
( 3/8) = -4c) (2) = -2d) ( -2/3) =
Estou preso nessas 4 e eu seria muito grato se alguem puder me ajudar obrigado :)

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The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?