As per Wikipedia, a problem is said to have optimal substructure if an optimal solution can be constructed from optimal solutions of its subproblems. Take the example of the Matrix Chain Multiplication problem below. AxBxCxD where A has dimension 2x3, B has dimension 3x5, C has dimension 5 x 3, and D has dimension 3 xl. (a) What is an optimal solution to the above problem? Show your work in form of a table.
(b) How many subproblems are there to the above problem?
(c) State completely each of the subproblems from (b).
(d) What are the optimal solutions to the subproblem(s) (listed in (c))?

the answer would be 2

since they are only saying that the couple has 20 daughters and so on but they never said that they went to the movies as well therefore the couple was the only people that went to the movies.

hope this ! : 3

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)