Which answer choice is the best first st 2y – 6 = -1 ? pls help asap

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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

Write the equation of the circle centered at (10,-2) with radius 2