Can you tell me the difference between primary and secondary sources?

In single precision (IEEE-754 standard), 8 bits are used for storing the exponent (the bias is 127), and 23 bits are used for storing the mantissa.  (a) What are the smallest and the largest positive numbers that can be stored in single precision? (b) What is the smallest value of the mantissa that can be stored?

Using the CRC polynomial 1101, compute the CRC code word for the information word, 1011101. Check the division performed at the receiver. You must show modulo 2 division at the receiver to receive full points. Show work   1011101001   1011101100   1011101110   1011101101