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svet-max [94.6K]
3 years ago
15

I need help on 2 questions !

Mathematics
1 answer:
Fudgin [204]3 years ago
6 0
4. Yes, line L is parallel to M because they do not intersect, the angles do not matter.

5.

A. 2 and 3 would be Alt. Int. Angles.

B. 2 and 4 are congruent angles.
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Two sides of an isosceles triangle measure 3 inches and 7 inches. Which could be the length of the third side?
MrRa [10]
7? An isosceles triangle has two indentical sides(you can remember that by saying you have TWO eyes hint EYEsosceles) but I’m guessing the bottom is 3 and the two sides are 7?
8 0
3 years ago
A tank contains 100 kg of salt and 1000 L of water. A solution of a concentration 0.05 kg of salt per liter enters a tank at the
Umnica [9.8K]

Answer:

Step-by-step explanation:

Initial Quantity of salt Q(0) = 100 kg

Capacity of tank = 1000 L

Inflow of liquid = 10 l /minute and outflow = same rate thus leaving the content of volume 1000 L at any time

Assume after entering constantly mixes and drains out.

Concentration flow = inflow - outflow

= 0.05(10) - \frac{Q(t)}{1000} *10

i.e. Q'(t) = 0.5-0.01Q(t), Q(0) = 100

Q'(t) = -0.01(Q(t)-50), Q(0) = 100\\\frac{dQ}{Q-50} =-0.01 dt\\ln |Q-5| = -0.01t +C\\Q-50 = Ae^{-0.01t}

Use Q(0) = 5

-45 = A  

So the equation would be

Q-50 = -45 e^{-0.01t} \\Q(t) = 50-45 e^{-0.01t} \\

a) Initial concentratin = \frac{100}{1000} =0.10

b) Use the solution fo rDE substitute t =1

Q(1) = 50-45e^(-0.01) = 5.4477 kg

c) As t becomes large Q = 50

So concentration limit = 50/1000 = 0.05

8 0
3 years ago
I need help !!!!! Please
Viktor [21]
The answer is c, since the square root of 81 is positive or negative 9.
Hope this helps
8 0
3 years ago
Please help!!!I’ll mark you as brainliest!!!!
KatRina [158]

Answer:

c, $28

Step-by-step explanation:

30% of 60 is 42

subtract ten and get 32

subtract four and get 28

4 0
3 years ago
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What is the vertex form of: y = 3x^2 - 12x + 5
Juli2301 [7.4K]

Answer:The vertex form is -y=a(x-h)2+k

Step-by-step explanation:

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3 years ago
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