please do both parts a&b. this is 1 question with parts. Thank you

What is the AGl limit above which each of the following taxpayers would not be eligible to receive a credit for the elderly or the disabled? Assuming that an AGI limitation does not apply, what amounts of credit for the elderly or the disabled would be permitted in each of the following instances? What is the AGl limit above which each of the following taxpayers would not be eligible to receive a credit for the elderly or the disabled? Assuming that an AGI limitation does not apply, what amounts of credit for the elderly or the disabled would be permitted in each of the following instances