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ICE Princess25 [194]
3 years ago
7

First, rewrite 7/9 and 16/21 so that they have a common denominator.

Mathematics
1 answer:
sattari [20]3 years ago
5 0
49/63 and 48/63..........
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Calculate the amount of hcn that gives the lethal dose in a small laboratory room measuring 12.0 ft×15.0 ft×8.50ft.
Anarel [89]
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, 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>
7 0
3 years ago
5+15 divided by 3 x 4 to the third power
julia-pushkina [17]

Answer:

325

Step-by-step explanation:

5 0
2 years ago
Help with these questions
balandron [24]

9514 1404 393

Answer:

  16) No

  17)  (c)

Step-by-step explanation:

For a lot of multiple-choice matrix problems, a simple test is all that is needed to determine the correct answer.

16) The determinant of A is (-2)(-2) -(2)(-3) = 10. So, we expect to see values in the inverse matrix that are 0.2 and 0.3. Alas, they're not there. The matrices are not inverses.

  A^-1 = [[-.2, .3][-.2, -.2]]

__

17) The matrices are both 3×3, so their product is possible (eliminates choice D). The upper left term is different among the answer choices, so we can determine the correct one by computing that term only.

  BA=C

  c11 = (5)(1) +(7)(5) +(3)(-1) = 5 +35 -3 = 37

This matches the third choice (C).

If you use a calculator to compute the full matrix product, it matches choice C in all details.

6 0
3 years ago
What is (4.25-1.75) divided by 25=
vichka [17]
4.25-1.75= 2.5

2.5/25= 0.1

The final answer is 0.1
8 0
2 years ago
Read 2 more answers
Type SSS, SAS, ASA, SAA, or HL to<br> describe these triangles.
viktelen [127]

Answer:

the answer is either SAS or ASA because the two triangles on the outside are equal but the one in between the two equal triangles is different in size

3 0
2 years ago
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