The demand for cars is modeled by the function f(x)=−x2+2x+15 , where x represents the number of stores in a city that sell cars. A company wants to know when the demand is positive. Is the interval (−3, 5) a reasonable solution to when the demand is positive?

No. The interval (−3, 5) is not a reasonable solution because the left endpoint is negative and there cannot be a negative number of stores.

Yes. The interval (−3, 5) is a reasonable solution because the function is positive in that region.

No. The interval (−3, 5) is not a reasonable solution because the function is negative in that region.

Yes. The interval (−3, 5) is a reasonable solution because the endpoints of the interval are roots of the function.

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.

answer is 1

step-by-step explanation: