A phone company charges customers a monthly charge using the equation C = 40 + 0.3m, where is the monthly
1 answer:
Option E
The person used the phone for 20 minutes that month
<em><u>Solution:</u></em>
Given that phone company charges customers a monthly charge using the equation:
C = 40 + 0.3m
Where,
"C" is the monthly charge in dollars
"m" is the number of minutes used by the customer
Someone's monthly charge is $46
To find: number of minutes used by that person
Therefore, given C = 46
Substitute C = 46 in given equation
46 = 40 + 0.3m
40 + 0.3m = 46
0.3m = 46 - 40
0.3m = 6
Thus the person used the phone for 20 minutes that month
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Answer:
0.0048cm/s
Step-by-step explanation:
Volume of the spherical balloon is expressed as;
dV/dt = dV/dr * dr/dt
Given
dV/dt = 5cm³/s
dV/dr = 4πr²
Since V = 972picm³
972π = 4/3πr³
972 = 4/3r³
4r³ = 972 * 3
r³ = (972 *3)/4
r³ = 729
r = ∛729
r = 9cm
dV/dr = 4π(9)²
dV/dr = 324π
dV/dt = dV/dr * dr/dt
5 = 324πdr/dt
dr/dt = 5/324π
dr/dt = 5/324(3.14)
dr/dt = 5/1017.36
dr/dt = 0.0048cm/s