Many smoke detectors contain:
1 answer:
Answer:
Option B, Americium-241, is the right answer.
Step-by-step explanation:
-
A device which senses smoke usually as an indicator of fire is known as a smoke detector.
- The two most common types of smoke detectors are the Ionization chamber and photoelectric smoke indicators.
- Many of these smoke detectors comprise some amount of americium-241, which is a radioactive substance.
- These smoke detectors respond immediately to fires that give off some smoke.
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You could say one person is at 1:5 and say they moved up and up
Cross Multiply:
Evaluate right side:
Divide by 2 on both sides:
Change the divide fractions to multiplication fraction:
Combine into single fraction:
Answer:
36 square feet
Step-by-step explanation:
area of the yard: 12×12=144
patio should be 1/4 of the yard, so 144:4=36 is the area of the patio
Let, width = x
length = 4x
perimeter = 2(4x+x) = 60
10x = 60
x = 6
so, 4x = 24
Area would be: 24*6 = 144 cm²
