The officers of a high school senior class are planning to rent buses and vans for a class trip. Each bus can transport 56 students, requires 4 chaperones, and costs 51,200 to rent. Each van can transport 7 students, requires 1 chaperone, and costs $110 to rent. Since there are 504 students in the senior class that may be eligible
go on the trip, the officers must plan to accommodate at least 504 students. Since only 52 parents have volunteered to serve as chaperones, the officers must plan to
use at most 52 chaperones. How many vehicles of each type should the officers rent in order to minimize the transportation costs? What are the minimal transportation
costs?
The officers should rent buses and vans to minimize the transportation costs.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

too hard the other guy did it

step-by-step explanation:

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%