What does, x, in the equation 2x-8=4 equal

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

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.

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?