12.3 1.Vector →p=<172,288,160>p→=<172,288,160> represents the price of certain models of bicycles sold by a bicycle shop

[answerhappygod]

12.3
1.Vector →p=<172,288,160>p→=<172,288,160> representsthe price of certain models of bicycles sold by a bicycle shop.Vector →n=<20,5,14>n→=<20,5,14> representsthe number of bicycles sold of each model, respectively. Calculatethe total sales of all the bicycles.
Sales =
2.
Vectors →vv→ and →ww→ havemagnitudes ||→v||=||v→||=19 and ||→w||=||w→||=5 and theangle between these vectors is 147°. What is their dot product?
(Give an answer accurate to two decimal places.)
→v⋅→w=
3.
A father is pulling his son on a sled at an angle of 19° withthe horizontal with a force of 29 lb (see the following image). Hepulls the sled in a straight path of 47 ft. How much work was doneby the man pulling the sled?
19°
29 lb
(Round your answer to the nearest whole number.)
Work =_______ ft-lbs