What is the domain, D, and the range, R, of the relation defined by
{(2,7), (2, 5), (2, 6), (2, 2)} ?
Please help

Chose the graph below that represents the following system of inequality’s

Yo y do yall have 2 stars that means yall wrong bro

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.