please i want an answer for these three questions

Quiz 1 1. When it is appropriate to use the data structure Array? What are the major disadvantages of the Array? 2. When linear search algorithm is better than binary search algorithm? Why?3. If the items in a list are structures or records taking 400 memory locations each, compare the amount of space required altogether if (a) the list is kept contiguouslyr in an array 85 percent full (b) the list is kept contiguously in an array 60 percent full and (c) the list is kept as a linked list (where the pointers take two memory locations each)