NEED HELP! Scores on a national English test are Normally distributed, with a mean score of 510 and a standard deviation of 75. Jaxon’s test score is in the 85th percentile. What is his test score, rounded to the nearest whole number?

Find the z-table here.

549
561
573
588

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.