Can someone tell me the common ratio? math help pls

common ratio is equal to ar^n-1.

a=-1/2, r=?

T2=-1=ar^n-1

n=2

-1/2*r ^2-1=-1

r=1

step-by-step explanation:

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let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2