This is a system of equations problem.
To easiest way to solve this is first add both equations.
12x + 21y + 21x + 12y = 51 + 15
So 33 y + 33x = 66
x + y = 2
We can use x = 2 - y and plug this in to equation #1.
12 ( 2 - y ) + 21y = 15
24 - 12y + 21y = 15
y = -1
x = 3
The ordered pair you are looking for is (3, -1)
We can already plug in 78 for d in this equation.
78 = 0.05s^2 + 1.1s
After subtracting 78 from both sides, we have:
0.05s^2 + 1.1s - 78 = 0.
Solving this quadratic, we have: s = 30.0000000000000004, -52.00000000000001
The last time I checked, we can’t go negative speed, so s = 30
It is actually 30.000000000000004, but just round it down.
The definition of a rational number is any number that can be expressed as the quotient or fraction p/q of two integers.
For example, 1/7 = 0.142857142857...
This keeps going, it never ends but it is still rational.
π, on the other hand is irrational because there is no pattern: 3.14159265358979323846...
Your number, as it appears has no pattern so it must be irrational.
Since this is an exponential growth, I probably means the number of people who started the challenge, B.
This is because as it is growing, the is exponentially growing of the the beginning variable, or the number of people in the beginning.
Sorry it's a bad explanation but I'm pretty sure the answer is B.
Do you guys understand my response?