In triangle DEF if overline EF is five centimeters longer than overline DE , overline DF is 17 centimeters shorter than the sum of overline EF and DE, and the perimeter of triangle DEF is 80 centimeters , find the length of overline EF 30.5 cm

Geometry paper. i don't know how to do the rest. questions 5. 8. 9. and 10.

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

Statement reason 1. δabc is similar to δced. given 2. 3. definition of slope 4. slope of slope of definition of slope 5. slope of × slope of multiplying the slopes 6. slope of × slope of substitution property of equality 7. slope of × slope of simplifying the right side the table contains the proof of the relationship between the slopes of two perpendicular lines. what is the reason for statement 2? a. parallel line segments that meet a common perpendicular line are proportional in length. b. the lengths of vertical and horizontal sides in congruent triangles are in a common ratio. c. trigonometric identities determine the lengths of the legs in a right triangle. d. corresponding side lengths in similar triangles are proportional in length.