How many inches are in 1 2/5 groups of 1 2/3 inches? PLEASE HEL I ONLY HAVE 10 MINUTES LEFT

The mathematical expression 9€ t means

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

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.