Please help quick please

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?