Answer:
80 parrots were purchased.
Step-by-step explanation:
Let the total number of parrots be k.
If 20% (or 20/100 = 1/5) flew away and 5% (5/100 = 1/20) died, the remaining parrots will be k – (¹/₅k + ¹/₂₀k) = k – ¼k = ¾k.
Of the remaining, 45% (or 45/100 = 9/20) were sold, which means the total number of sold parrots will be ¾k × ⁹/₂₀ = ²⁷/₈₀k.
The remaining parrots = ¾k – ²⁷/₈₀k = ³³/₈₀k = 33
k = 33 × ⁸⁰/₃₃ = 80 parrots were purchased.
Dimensions of the room in cm = 2.54 x 12 by 15 x 2.54 by 2.54 x 8.5 = 30.48 by 38.1 by 21.59
Volume of the room in cubic cm = 30.48 x 38.1 x 21.59 cubic cm = 25,072.21 cubic cm
Given that the density of air at room temperature is
![0.00118g/cm^3](https://tex.z-dn.net/?f=0.00118g%2Fcm%5E3)
, thus the mass of air in the room = 25,072.21 x 0.00118 = 29.59 g = 0.0296 kg
Given that the lethal dose of HCN is approximately 300 mg HCN per kilogram of air when inhaled, thus the <span>amount of HCN that gives the lethal dose in the small laboratory room is given by 300 x 0.0296 =
8.88 mg.</span>
Answer:
.70
Step-by-step explanation:
5 and up round up so it would round to .7
Answer:
490.0...
Step-by-step explanation:
4.9 x 10^2
(squared)
4.9 x 10 x 10
the easiest way to do this is to move the decimal 2 places to the right, as
10 x 10 = 100
4.9 x 100 = 490.0...
Answer:
![y = \frac{1}{8} x - 3](https://tex.z-dn.net/?f=y%20%3D%20%20%5Cfrac%7B1%7D%7B8%7D%20x%20-%203)
Step-by-step explanation:
Formula for straight lines:
![y = mx + b](https://tex.z-dn.net/?f=y%20%3D%20mx%20%2B%20b)
where m = slope, b = constant
Given:
y-intercept = -3 (0, -3)
m = ⅛
Substitute into formula to find b.
![- 3 = \frac{1}{8} (0) + b \\ - 3 = 0 + b \\ b = - 3](https://tex.z-dn.net/?f=%20-%203%20%3D%20%20%5Cfrac%7B1%7D%7B8%7D%20%280%29%20%2B%20b%20%5C%5C%20%20-%203%20%3D%200%20%2B%20b%20%5C%5C%20b%20%3D%20%20-%203)
Substitute b into original formula
![y = mx + b \\ y = \frac{1}{8} x + ( - 3) \\ y = \frac{1}{8} x - 3](https://tex.z-dn.net/?f=y%20%3D%20mx%20%2B%20b%20%5C%5C%20y%20%3D%20%20%5Cfrac%7B1%7D%7B8%7D%20x%20%2B%20%28%20-%203%29%20%5C%5C%20y%20%3D%20%20%5Cfrac%7B1%7D%7B8%7D%20x%20-%203)