A certain fourth-order model has the roots s = −2 ± 6j, −10 ± 7j Identify the dominant roots and use them to estimate the system's time constant, damping ratio, and oscillation frequency. a. s = −2 ± 6j b. s = −10 ± 7j

Indicate the formula for the following conditions: p^c(n,r)=

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

Arational number that is equivalent to -20/4?