5-[(5^2-3^2) = 4]+6 idk how to solve it

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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