A cat is stuck on the roof if the ladder is 18 ft long and must be placed 9 feet away from the building how high can the ladder reach up the building to help save the cat.

20.1

Step-by-step explanation:

a^2+b^2=c^2

18^2+9^2=c^2

324+81=405

c^2 = crosses itself out

the square root of 405 is 20.1

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: