Estude a variação do sinal das seguintes funções do 1º grau: a)f(x)=-3x
b)f(x)=2-3x
c)f(x)=2x+5
d)f(x)=-3x+6
e)f(x)=1-5x

Pfv eu preciso urgente de ajuda

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.