The figure shows a video sequence consisting of three video clips placed side by side on a timeline. Which nonlinear editing tool lets you lengthen the middle clip (blue color) while maintaining the duration of the entire video sequence by pushing the In point of the adjacent clip? The second figure shows the resulting video sequence.

____ boxes are similar to radio buttons or checkboxes, but they allow you to present a long list of options in much less space on the page because the user clicks to open and close the list.

A. Drop-down B. Multi-select C. Pull-down D. Option

Solve the following system using the substitution method or the linear combination method. If there are infinitely many solutions or no solution, so indicate.

What will be an ideal response?