estimation

Question

Rita goes to the mall. If n is the number of items she bought, the expression 11.54n + 28 gives the amount she spent in dollars at one store. Then she spent 30 dollars at another store. Find the expression which represents the amount Rita spent at the mall. Then estimate how much Rita spent if she bought 6 items. * Combine the expressions and simplify.

 

What expression represents the amount in dollars that Rita spent at the mall?

 

$4,176

 

$76

 

$72

 

$130

 

 

Answer 1

11.54n + 28 + 30

 

= 11.54n + 58

 

"estimate how much Rita spent if she bought 6 items"

 

11.54(6) + 58 ≈ 12(6) + 58 = 72 + 58 = $130

Answer 2

Hi Jesika;

 

one store...11.54n + 28

two stores...11.54n + 28 + 30

..................11.54n + 58

 

She bought six items.

If $30 is on five items, n=(6-5)=1...

11.54n + 58

[(11.54)(1)]+58

11.54+58

69.54

If $30 is on four items, n=(6-4)=2

[(11.54)(2)] + 58

23.08+58

81.08

If $30 is on three items, n=(6-3)=3

[(11.54)(3)] + 58

34.62+58

92.62

If $30 is on two items, n=(6-2)=4

[(11.54)(4)] + 58

46.16+58

104.16

If $30 is on one item, n=(6-1)=5

[(11.54)(5)] + 58

57.70+58

115.70

None of the answers match.