(5x2 + 23x - 7) - (x2 - 4x + 21) is equivalent to expression

4x² - 27x - 28 is the answer

Step-by-step explanation:

As per question,

(5x² + 23x - 7) - (x² - 4x + 21)

Removing the parentheses,

→ 5x² + 23x - 7 - x² + 4x - 21)

Now reorder and gather the like terms,

→ (5x² - x²) + (23x + 4x) + ( -7-21 )

Collecting the coefficients of like terms,

→ (5-1)x² - (23+4)x + ( -7-21 )

Calculating them now, we get,

→ 4x² - 27x - 28

So, (5x² + 23x - 7) - (x² - 4x + 21) = 4x² - 27x - 28

answer: it's d

step-by-step explanation:

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.