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

B. 72

Explanation:

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Answer 2

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

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(\$)/(pack)`

Find out what is the price of 9 packs of spaghetti

Multiply the unit rate by 9

`8(\$)/(pack)(9\ packs)=\$72`

therefore

The price of 9 spaghetti packs is $72