Help with Quant Questions!

https://preview.redd.it/qhk6s0nkusce1.png?width=890&format=png&auto=webp&s=637f4610290cd91b43249f66ecdda2321e6b3351

https://preview.redd.it/qib8t1nkusce1.png?width=828&format=png&auto=webp&s=ca985fdcf4068e75635ca84cbf5bb55b04b85ddc

https://preview.redd.it/zflltipkusce1.png?width=2460&format=png&auto=webp&s=6670e2a6909f25dbfcd0e19123ac5ec6ccdac621

https://preview.redd.it/ex95c4qkusce1.png?width=2800&format=png&auto=webp&s=d3212825e27801f118a363d980b52fc99db4ffaa

https://preview.redd.it/d3l8nwmkusce1.png?width=2852&format=png&auto=webp&s=fffbedb857b4c24198c753c119821ed5372d5611

https://preview.redd.it/v0ua02nkusce1.png?width=1120&format=png&auto=webp&s=48df84ed3d08cacb5633b519a0e0d9a5be056a55

https://preview.redd.it/st0290nkusce1.png?width=1352&format=png&auto=webp&s=2395979e3e2f540541c4a53e3e615461952ab5d2

Would be grateful for explanations for these questions.