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I really need help solving this problem, can you plzz help me with it?

Here is the problem:

An operator A, representing observable A, has two normalized eigenstates w1 and w2, with eigenvalues a1 and a2, respectively. Operator B, representing observable B, has two normalized eigenstates Q1 and Q2, with eigenvalues b1 and b2. The eigenstates are related by:

w1=(3Q1+4Q2)/5, w2=(4Q1-3Q2)/5

a) observable A is measure, and value a1 is obbtained . What is the state of the system after the measurement?

b) If B is now measured, what are the possible results and what are their probabilites.

c) Right after the measurement of B, A is measured again. What is the probability of getting a1?

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# Sequential measurements

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