Identify the domain and range of the following function {(3, 7), (10, 18), (15, 21)}
a) domain: 3, 7, 10 range: 18, 15, 21
b) domain: 3, 10, 15 range: 7, 18, 21
c) domain: 7, 18, 21 range: 3, 10, 15
d) domain: 18, 15, 21 range: 3, 7, 10

Option B) domain: 3, 10, 15 range: 7, 18, 21

Step-by-step explanation:

we have

{(3, 7), (10, 18), (15, 21)}

Remember that

The domain are all possible values of x or input values of the function

The range are all possible values of y or output values of the function

In this problem

the input values are 3,10,15

the output values are 7,18,21

therefore

domain: 3, 10, 15 range: 7, 18, 21

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: