Please help me on this. It would mean a lot to me. 1 ) prove that h²(cot² α - cot² β) = 2α²

2 ) if α=20°, β=30°, AC=360m, find the height of PQ​

(i beg for proper answers for these 2 questions please)​

a

step-by-step explanation:

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %

  answer:

  write 548 as 500 + 40 + 8. multiply each addend by 5. then add the three products to get 2,740.

what steps are you having us

step-by-step explanation: