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velikii [3]
3 years ago
9

A cell phone company charges a monthly fee plus $0.25$0.25 for each text message. The monthly fee is $30.00$30.00 and you owe $5

9.50$59.50. Write and solve an equation to find how many text messages xx you had.An equation is
Mathematics
1 answer:
Oksi-84 [34.3K]3 years ago
5 0
<span>Equation: $59.50 - $30.00 = $0.25X =$29.50 = $0.25X =$29.50/$0.25 = X = 118 text messages used Explanation - First you take the total bill less the monthly fee of $30 to get $29.50. This amount represents the amount of the bill generated by the text messages you used. Then you divide this amount by $0.25 to get the total number of text, which is 118.</span>
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Answer:

The given function symmetric about the y-axis.

Step-by-step explanation:

The given function is

r=9\sin 7\theta                .... (1)

1. Symmetry about the x-axis: If the point (r, θ ) lies on the graph, then the point  (r,-θ ) or (-r, π - θ ) also lies on the graph.

2. Symmetry about the y-axis: If the point (r, θ ) lies on the graph, then the point (r,π - θ ) or (-r, -θ ) also lies on the graph.

3. Symmetry about the origin: If the point (r, θ ) lies on the graph, then the point (-r, θ ) or (r, π + θ ) also lies on the graph.

Put (r, -θ ) in the given function.

r=9\sin 7(-\theta)=-9\sin 7\theta=-r\neq r

Therefore it is not symmetric about x-axis.

Put (-r, -θ ) in the given function.

-r=9\sin 7(-\theta)=-9\sin 7\theta=-r

Therefore it is symmetric about y-axis.

Put (-r,θ ) in the given function.

-r=9\sin 7(\theta)=r\neq -r

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