Please help when you give me the answer jus say 1 then whatever the answer is then 2 the answer and yea thank you!!

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

There are 18 female students and 16 male students in a class. which of the following expresses the ratio of female students to male students in simplest form? а) 10 b) 9 to 8 c) 8: 9 d)18/16