B. Solve this real-world multistep algebra problem. Kayla takes pictures during her hike in Death Valley to add to her vacation
album.
On Tuesday, she takes 25 pictures.
On Wednesday, she takes 42 pictures.
Then she deletes 17 pictures she doesn't like and has a total of 134 pictures.
How many pictures did she start with? Use x to represent the starting number.
a. Use the information in the problem to fill in the first row of blanks, and then solve
the problem.
100 POINTS

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.