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
Answer:
b
Step-by-step explanation:
Answer:
1. 0.75 cm to 1 km
4. 0.3 mm to 40 m
Step-by-step explanation:
we have the scale

<u><em>Verify each case</em></u>
case 1) 0.75 cm to 1 km

therefore
The scale is equivalent to the given value
case 2) 1 cm to 12 km


therefore
The scale is not equivalent to the given value
case 3) 6 mm to 2 km
Remember that
1 cm= 10 mm
1 mm=0.1 cm
we have


therefore
The scale is not equivalent to the given value
case 4) 0.3 mm to 40 m
Remember that
1 cm= 10 mm -----> 1 mm=0.1 cm
1 km=1,000 m ----> 1 m=0.001 km
we have


therefore
The scale is equivalent to the given value
case 4) 1 inch to 7.62 km
Remember that
1 in= 2.54 cm
we have


therefore
The scale is not equivalent to the given value
I have no answer i just doing it for point
Answer:
85.9
Step-by-step explanation: