This is ! ! 25 if you are correct i will mark u brainliest! an equation and the steps to solve it are shown below: 4x minus one over five times the quantity 15x plus 10 equals 3 step 1: 4x – 3x + 2 = 3 step 2: x + 2 = 3 step 3: x + 2 − 2 = 3 − 2 step 4: x = 1 in which step was the error made and why?

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.