Could you me with one algebra problem?
construct the appropriate number sets with the given information. use the sets to match the following:
given
a = ø
b = b
c = then a ∪ b = b
d = a
e = then a ∩ b = b
i have to match these options:
1. if ab
2. if ba
3. a ∪ ø
4. a ∩ ø
5. b ∪ ø
with these options:
c
a
d
b
e

For how answer my question this will be the last question can you answer in math subject

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.

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?