21 trucks, each with a 2.5-ton payload, are needed to unload a freight train. b find the constant of variation.

2.5-ton payload per truck

Step-by-step explanation:

Given the following equation:

total payload = 2.5-ton payload per truck * number of trucks

it can  be rewritten as:

y = k*x

where y and x are variables and k is the constant of variation. Comparing these two equation, we see that 2.5-ton payload per truck is the constant of variation, and total payload and number of trucks are the directly variated variables, because when the number of trucks  increase, the total payload also increased.

4038

step-by-step explanation:

pleaze mark brainliest!

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.