In a survey of men in a certain country​ (ages 20 - ​29), the mean height was 66.9 inches with a standard deviation of 2.7 inches. What height represents the 90th ​percentile?

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?