12. Seán has a pile of tiles, each measuring 1 cm by 1 cm. He tries to put these small tiles together to form a larger square of length ncm, but finds that he has 92 tiles left over. If he had increased the side
length to (n + 2) cm, then he would have been 100 tiles short. How many tiles does Seán have?

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

answer: .75 km

step-by-step explanation:

50-60=10

step-by-step explanation: