TOTUOLIO PUCILIUL VIOTY
Score: 0 of 1 pt
13 of 15 (13 complete)
HW Score: 73.33%, 11 of 15 pts
X 9.C.43
Question Help
A certain element has a half life of 25 billion years
a You find a rock containing a mocture of the element and lead. You determine that 55% of the original element remains the other 45% decayed into lead. How old is the
rock?
b. Analysis of another rock shows that it contains 20% of its original element, the other 80% decayed into lead How old is the rock?
a The rock is approximately billion years old
(Round to one decimal place is needed)
Incorrect: 2

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.