Which size bottle of ketchup is the best deal with the lowest unit price? Prices for Different Sizes of Bottles of Ketchup Size
2 answers:
Answer:
Option b. 14 oz
Step-by-step explanation:
We have to find which size of bottle of ketchup is the best deal with the lowest unit price.
Prices for different sizes of bottles are given we have to calculate the unit price of each bottle.
a. 10 oz = $2.50
Cost per oz = = $0.25 per oz
b. 14 oz = $2.80
Cost per oz = = $0.20 per oz
c. 16 oz = $4.00
Cost per oz = = $0.25 per oz.
d. 18 oz = $5.40
Cost per oz = = $0.30 per oz
Therefore, the lowest price of the bottle of 14 oz.
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Answer:
- movie: $3.75
- video game: $5.75
Step-by-step explanation:
Two equations in two unknowns can be written:
3m +5v = 40
9m +7v = 74
These can be solved a variety of ways. One of them is using Cramer's rule. It tells you the solution to
- ax +by = c
- dx +ey = f
is given by ...
- ∆ = bd -ea
- x = (bf -ec)/∆
- y = (cd -fa)/∆
For the numbers above,
- ∆ = 5·9 -7·3 = 24
- m = (5·74 -7·40)/24 = 90/24 = 3.75
- v = (40·9 -74·3)/24 = 138/24 = 5.75
The rental cost for each movie is $3.75; for each video game, it is $5.75.
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The attached graph shows a graphing calculator solution to these equations.
