What is the value of 5x³+4y³ when x=4 and y=3

 428

Step-by-step explanation:

This is a substitution problems,

Just substitute for the values of x and y , multiply them out and add.

Here we go;

                5x³  + 4y³

            =  5(4³)  + 4(3³)

            =  5( 4 x 4 x 4 ) + 4( 3 x 3 x 3)

            =  5 x 64 + 4 x 27

            =  320 + 108 add directly or find the common factor

            =  4(80 + 27)

            =  4(107)

            =  4 x 107

            =  428

step-by-step explanation:

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: