Question

The double number line below shows the prices for a certain number of packs of spaghetti at a store. Which statement correctly gives and explains the price of 9 spaghetti packs?
A. $18, because the price of each pack is $2
B. $72, because the price of each pack is $8
C. $80, because the price of each pack is $8
D. $144, because the price of each pack is $16

Answer 1

Answer:

Option B. $72, because the price of each pack is $8

Step-by-step explanation:

Looking at the double number line we have that

The price of 2 packs of spaghetti is $16

The price of 4 packs of spaghetti is $32

The price of 6 packs of spaghetti is $48

The price of 8 packs of spaghetti is $64

To find out he units rate, divide the price by the number of packs

$\ 16/2=8\frac{\ }{pack}$

Find out what is the price of 9 packs of spaghetti

Multiply the unit rate by 9

$8\frac{\ }{pack}(9\ packs)=\ 72$

therefore

The price of 9 spaghetti packs is $72