What the least number which is a perfect square and exactly divisible by
18, 24 and 36.

144

Step-by-step explanation:

The answer is 144 because we can take any multiple of 72, the LCM of 18, 24, and 36, but 72 is not a perfect square. So, we go to the next multiple, 144, which is a perfect square, so the answer is 144. Hope it helps!

last one.

step-by-step explanation:

last one.

generally speaking, the others follow some sort of pattern that correlates to either linear (looks like a straight line) or sinusoidal (looks like an s).

the last one is just a random cloud of points that doesn't correlate to any particular known order.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47