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pickupchik [31]
3 years ago
8

How do i simplify -2x - y - 2z ???

Mathematics
1 answer:
MaRussiya [10]3 years ago
5 0
- (2x+y+2z) = -(2(x+z) + y)
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A thermometer is taken from a room where the temperature is 24oc to the outdoors, where the temperature is −15oc. After one minu
kap26 [50]

Solution:

Use Newton's Law of Cooling.  


T = T_s + (T_0 - T_s)*e^(-kt)  


where  

T = temperature at any instant  

T_s = temperature of surroundings  

T_0 = original temperature  

t = elapsed time  

k = constant  


Now, we need to find this constant. We are given that after one hour, the temperature drops to 13° C in a 7°C Environment.  

T = 14, T_0 = 24, T_s = -15, t = 1, k = ?  

T = T_s + (T_0 - T_s)*e^(-kt)  

==> 14 = -15 + (24 - 7)*e^(-k)  

==> 14 = 7 + 17*e^(-k)  

==> 7 = 17*e^(-k)  

==> 7/13 = e^(-k)  

==> -k = ln(7/17)  

==> k = -ln(7/17) ≈ 0.774  

Now,


Let's calculate temperatures!  

T = ?, T_0 = 24, T_s = -15, k = 0.773, t = 3  

T = T_s + (T_0 - T_s)*e^(-kt)  

==> T = -15 + (24 –(-15))*e^[ -(0.774)(2) ]  

==> T = -15 + 39*e^(-1.548)  

==> T ≈ 15.72° C  

This the required answer.


7 0
3 years ago
You can draw a quadrilateral with two sets of parallel lines and no right angles. true false
yuradex [85]
False. When a quadrilateral has two sets of parallel sides ,like I drew below, all four corners form right angles.

5 0
3 years ago
Read 2 more answers
Walter is conducting an experiment using a spinner with 4 equal sections. Which number of trials will lead to experimental outco
Vesna [10]

Answer:

90

Step-by-step explanation:

I took the test and 90 gives u the most variability in your outcome so ur answer is more reliable.

7 0
3 years ago
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F(x)=x2. What is g(x)?
mixas84 [53]

Answer:

A and B

Step-by-step explanation:

1/4x^2 = (1/2x)^2

6 0
3 years ago
A(7x + 3) = b + 14x what The value of A
Ugo [173]
Answer: The value of A would be 2.
8 0
2 years ago
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