A teacher grades 27 tests in 3 hours Find the constant of variation
1 answer:
Answer:
<h2>9</h2>
Step-by-step explanation:
Step one:
given
Let the number of tests graded be g = 27
time taken t = 3 hours
Required
The constant relating the time and the number of tests
Step two:
<em>"The constant of variation is the number that relates two variables that are directly proportional or inversely proportional to one another."</em>
so that the direct variation is
g∝kt
g=t/k
k= g/t
k=27/3
k=9
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X + y = 8
x - y = 12
--------------add
2x = 20
x = 20/2
x = 10
x + y = 8
10 + y = 8
y = 8 - 10
y = -2
ur numbers are 10 and -2
Answer:
495
Step-by-step explanation:
12 Choose 4 = (12!) / 4! 8! = (12 · 11 · 10 · 9) / (4 · 3 · 2) = 495
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Step-by-step explanation:
