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noname [10]
3 years ago
13

How many parallel lines does a square have?

Mathematics
1 answer:
Anestetic [448]3 years ago
8 0
A square  has two pairs of parrallel lines :) I hope it helps :)

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-4= 7x-(-1) / -8<br><br> Solve for x <br><br> (Solving multi step equations)
Evgen [1.6K]
Multiply both sides by -8.
Then add the one to both side to cancel it out and get 7x by itself
Then divide the whole thing by 7. So it’ll look like this: 32+1=7x and then add the one then divide by 7
4 0
3 years ago
What is the value of x?​
pogonyaev

Answer:

1 is the value of x

Step-by-step explanation:

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4 0
3 years ago
-2+3n&gt;-14<br> A -16/3<br> B -3<br> C -20/3<br> D none of the above
Sophie [7]
The answer is B (-3).                                   
                                                                   -2+3n>-14
                                                                   +2       +2
                                                                   3n>-12
                                                                     n>-4
6 0
3 years ago
0.03256 3 s.f help please
Andrews [41]

Answer:

Step-by-step explanation:

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4 0
3 years ago
An important tool in archeological research is radiocarbon dating, developed by the American chemist Willard F. Libby.3 This is
Radda [10]

Answer:

Q(t) = Q_o*e^(-0.000120968*t)

Step-by-step explanation:

Given:

- The ODE of the life of Carbon-14:

                                       Q' = -r*Q

- The initial conditions Q(0) = Q_o

- Carbon isotope reaches its half life in t = 5730 yrs

Find:

The expression for Q(t).

Solution:

- Assuming Q(t) satisfies:

                                       Q' = -r*Q

- Separate variables:

                                      dQ / Q = -r .dt

- Integrate both sides:

                                       Ln(Q) = -r*t + C

- Make the relation for Q:

                                       Q = C*e^(-r*t)

- Using initial conditions given:

                                       Q(0) = Q_o

                                       Q_o = C*e^(-r*0)

                                      C = Q_o    

- The relation is:

                                       Q(t) = Q_o*e^(-r*t)

- We are also given that the half life of carbon is t = 5730 years:

                                       Q_o / 2 = Q_o*e^(-5730*r)

                                        -Ln(0.5) = 5730*r

                                        r = -Ln(0.5)/5730

                                        r = 0.000120968          

- Hence, our expression for Q(t) would be:

                                       Q(t) = Q_o*e^(-0.000120968*t)                                    

7 0
3 years ago
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