Answer: option A and D results in 3 significant figures.
Step-by-step explanation:
A.
The number 17.6 has three significant figures.
B.
The number 119.25 has 5 significant figures
C.
The number of 19.83 has 4 significant figures.
D.
The number of 25.5 has 3 significant figures.
Hence, option A and D results in 3 significant figures.
Answer:
s ≈ - 0.5 , s ≈ 8.5
Step-by-step explanation:
s² - 8s - 4 = 0 ( add 4 to both sides )
s² - 8s = 4
To complete the square
add ( half the coefficient of the s- term )² to both sides
s² + 2(- 4)s + 16 = 4 + 16
(s - 4)² = 20 ( take square root of both sides )
s - 4 = ± ( add 4 to both sides )
s = 4 ±
Then
s = 4 - ≈ - 0.5 ( to the nearest tenth ) ← smaller solution
s = 4 + ≈ 8.5 ( to the nearest tenth ) ← larger solution