Jordan solved the equation −7x + 25 = 48; his work is shown below. identify the error and where it was made.

−7x + 25 = 48
step 1: −7x + 25 − 25 = 48 − 25
step 2: −7x = 23
step 3: -7x/7 = 23/7
step 4: x = 23/7
step 1: he should have added 25 to each side.
step 1: he should have divided both sides by −7.
step 3: he should have divided both sides by −7.
step 3: he should have multiplied both sides by −7.

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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.