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?

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)