4(-3) + 3(-5) + 7
-12+-15+7=-20
Answer:
80 students
Step-by-step explanation:
400/80%=320
400-320=80
The
equation of velocity of sound in air is v = 20 √(273 + t). In this problem, we
need to find the temperature when the velocity is 329 meters/s. You need
to measure the time it takes a sound to travel a
measured distance in order to measure its speed in air.
Given:
Velocity
of sound in air equation = v = 20 √(273 + t)
Velocity
= 329 m/s
To
solve:
V = 20 √(273 + t)
<span>
329 = 20 * sqrt(273 + t)</span>
<span>
16.45 = sqrt(273 + t)</span>
<span>
273 + t = 16.45^2</span>
<span>
t- 16.45^2-273</span>
<span>
t = -2.4 degrees Celsius</span>
<span>So, the
temperature when the velocity is 329 meters per second is -2.4 degrees Celsius.</span>
We have two slots A and B
Slot A has 4 choices (2,4,5,8)
Once we make a choice, we can't reuse it. So we have 3 choices left for slot B
Multiply out the values mentioned above to get: 4*3 = 12
Alternatively you can use the nPr formula to get
n P r = (n!)/(n-r)!
4 P 2 = (4!)/(4-2)!
4 P 2 = (4!)/(2!)
4 P 2 = (4*3*2*1)/(2*1)
4 P 2 = 24/2
4 P 2 = 12
yielding the same answer
So no matter which method you use, the final answer is 12
Detailed Answer:
An algebraic equation can be defined as a mathematical statement in which two expressions are set equal to each other.
Example of Algebraic Equations:
Eg. 1) x + 10 = 20
Eg. 2) 5x + 10 = 20
Eg. 3) 2x + 2 = 4
