Type the correct answer in the box. Spell all words correctly. Tom wants to find a number so that the sum of the digits of a two-digit number is 7. When reversing the digits, the number should increase by 27. He writes a computer program to find the number. How will the program represent the number?
A ___ is used to represent an unknown number.

Which best describes the role or restriction enzymes in the analysis of edna a. to break dna into fragments that vary in size so they can be sorted and analyzed b. to amplify small amounts of dna and generate large amounts of dna for analysis c. to purify samples of dna obtained from the environment so they can be analyzed d. to sort different sizes of dna fragments into a banding pattern that can be analyzed