Carlos was planning a trip to saudi arabia. before going, he did some research and learned that the exchange rate is 3.7 riyals for $1. how many riyals would he get if he exchanged $3.80?

14.06 Riyals

Step-by-step explanation:

Given:

The exchange rate 3.7 Riyals for $1.

And Carlos exchanged $3.80.

We need to find how many Riyals would he get if he exchanged $3.80.

The exchange rate of $1 = 1 3.7 = 3.7 Riyals

For $2 = 2 3.7 = 7.4 Riyals

Similarly for $3.80 = 3.80 3.7 = 14.06 Riyals

Therefore, the exchange rate of $3.80 is 14.06 Riyals.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.