Grace starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 14 each week for a number of weeks, w. she writes the expression 100(14)w to find the amount of radioactive substance remaining after w weeks. ryan starts with 1 milligram of a radioactive substance. the amount of the substance decreases by 40% each week for a number of weeks, w. he writes the expression (1 – 0.4)w to find the amount of radioactive substance remaining after w weeks. use the drop-down menus to explain what each part of grace's and ryan's expressions mean.

Write the following as a base and exponent

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.