Buying the same number each week signals a linear model: a starting total plus a fixed amount for every week. Find the total at week , then multiply the weekly increase by the number of weeks and add it to that starting total. Don't multiply the starting stickers by weeks; Maya owned those stickers before any buying began.
Hints
- Hint 1
A starting value is the amount already there before any time passes. Think about week : how many stickers does Maya have before buying any new ones?
- Hint 2
A rate tells you how many stickers get added each week. To find how many she buys after weeks, multiply the weekly amount by . Which given number belongs next to ?
Step-by-step
Start with what Maya has, then add what she buys
Step 1Find the starting count
No Desmos needed. The story gives the starting count and weekly addition directly. At weeks, Maya has stickers. That's the starting value: it stays constant because she already owns those stickers before the weekly purchases begin.
- Step 2
Find the amount added after x weeks
Maya buys stickers each week, so after weeks she has bought stickers. The rate is stickers per week, so , not , gets multiplied by .
- Step 3
Write the total
Add the stickers Maya already had to the stickers she bought to get the total:
Multiply the weekly addition by the weeks, then add the starting count. So gives Maya's total number of stickers after weeks. Choice B.