a)The n term of an Arithmetic Progression is 8n - 3. Determine which term in A.P is equal to 85.b)The first term of an A.P is 3. The sum of the first 8 terms is 136 and the sum of the entire series is...

a)The n term of an Arithmetic Progression is 8n - 3. Determine which term in A.P is equal to 85.b)The first term of an A.P is 3. The sum of the first 8 terms is 136 and the sum of the entire series is 820. Determine the common difference and the number of terms.