Answer:
30
Step-by-step explanation:
Exterior angle equals sum of opposite interior angles
3x = 2x + 30
3x - 2x = 30
x = 30
Answer:
In February, 423 daytime minutes is used
Step-by-step explanation:
Let the base plan charges be x
And cost per daytime minute be y
In December,
x + 510y = 92.25------------------(1)
In January,
x + 397y = 77.56---------------------(2)
Subtracting eq(2) from eq(1)
x + 510y = 92.25
x + 397y = 77.56
-------------------------------
0 + 113y = 14.69
-------------------------------
y = \frac{14.69}{113}
y = 0.13----------------------------------(3)
Substituting (3) in (1)
x + 510(0.13) = 92.25
x + 66.3 = 92.25
x = 92.25 - 66.3
x = 25.95
So In February
base plan + (daytime minute)(cost per daytime minute) = 80.9
25.95 + (daytime minute)(0.13) = 80.9
(daytime minute)(0.13) = 80.9 - 25.95
(daytime minute)(0.13) = 54.95
(daytime minute) =
daytime minutes = 422.69
daytime minute 
Answer:
50
Step-by-step explanation:
20/2 is 10 so 10x5 is 50
Answer:
she borrowed 15 so make a chart that starts with the 135 she has then add a line that shows the 15 she borrowed
Answer:
1) The distance between two consecuitive peaks is called the wavelenght, so:
A = wavelenght.
The middle of the wave is called the rest position, so:
D = Rest position.
The distance between a peak and trough is called the wave heigt, so:
C = Wave height.
The distance between the rest position and a peak or a trough, is called the amplitude of the wave:
B = Amplitude.
2) Usually in high frequency waves we have shorter wavelenghts and in low frequency waves whe have larger wavenelgths, this is because the relation between frequency and wavelenght comes from:
velocity = wavelength*frequency.
if the velocity is constant, and we have a increace in the frequency, the wavelenght must decrease (so the velocity remains constant).
The same happens if the frequency decreases, the wavelenght must increase.
