Consider two decision problems X and Y. If X reduces in polynomial time to 3-SAT and 3-SAT reduces in polynomial time to Y. Which of the following can be inferred from the previous statement? Group of answer choices

a. X is in NP and Y is in NP-Hard
b. Y is in NP and X is in NP-Hard
c. Both X and Y are in NP-hard.
d. Both X and Y are in NP.

2.)how does a graphical user interface (gui) on a touchscreen interface differ from a gui on a desktop or laptop? a.)a finger or stylus is used instead of a pointer. b.) a magic wand is used instead of a pointer. c.)users speak commands instead of using a pointer. d.)users visualize commands instead of using a pointer.

Is the following an example of social media viral marketing? indicate your response by selecting yes or no. when you sign onto your favorite social networking website, you get messages from friends who have seen a television show they thought was a "must see! "

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.