The daily lowest temperature, in degrees fahrenheit, for a certain week are -2, -3, x, 2x, 4, 8. for the week, the sum of the temperatures was -7°f. what is the value of x? a.–3 b.–1 c.1 d.3

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.

3x = 729 solve for x plz . it's urgent. will mark

Measure a and b and find their sum. how are the angles related?