I think it’s c but I could be wrong
So theres 4 hours and 60min equals 1 hour, so multiply 4 by 60 to get 240, so theres 240 minutes of time on the mp3. So 1/6 of that total time (240min) was on jazz, so what you do is divide 240 by 6 to get 40, so every 1/6 is 40min. So you could say he spend 40min listening to jazz, or you could say he spent 2/3 of an hour listening to jazz
It is called an acute angle
If you talk for 384.23 minutes the two plans will have the same cost.
<h3>What is a system of equations?</h3>
A system of equations is two or more equations that can be solved to get a unique solution. the power of the equation must be in one degree.
x is the number of minutes that will be used during a month:
C₁ = 0.24x
C₂ = 49.95 + 0.11x
So, when 1st = 2nd
0.24x = 49.95 + 0.11x
0.24x - 0.11x = 49.95
0.13x = 49.95
x = 49.95/0.13
x = 384.23 minutes
Hence, If you talk for 384.23 minutes the two plans will have the same cost.
Learn more about equations here;
brainly.com/question/10413253
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Answer:
k = ± 4
Step-by-step explanation:
Given
x² - kx + 4 = 0 ← in standard form
with a = 1, b = - k, c = 4
The equation has equal roots, thus the discriminant
b² - 4ac = 0, that is
(- k)² - (4 × 1 × 4) = 0
k² - 16 = 0 ( add 16 to both sides )
k² = 16 ( take the square root of both sides )
k = ± 
= ± 4
