There is a bag filled with 3 blue and 4 red marbles a marble is taken at random from the bag the colour is noted and then it's replaced another marble is taken at random what is the probability of getting at least 1 red?

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?