(giving if u helpp mee) What is static electricity?

A) Build up of electrical charges on the surface of an object
B) Build up of light energy that causes electrical charges to move
C) The flow of electrical charges in a conductor
D) The movement of electrical charges through an insulator

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.

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.

How can i differentiate this equation?