Use the lists of factors to answer the question. factors of 9: 1, 3, 9 factors of 15: 1, 3, 5, 15 factors of 21: 1, 3, 7, 21 factors of 40: 1, 2, 4, 5, 8, 10, 20, 40

9 and 40

21 and 40

Step-by-step explanation:

just took the test on edg. 2020

good luck!

cutie~

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.