The picture below is a flood gauge that is used to measure how far (in feet) a river’s water level is above or below its normal level.

70,000 + 6,000 + 800 + 30

step-by-step explanation:

i believe the answer is 323 ft

step-by-step explanation:

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secant-secant formula:

(whole secant) x (external part) =           (whole secant) x (external part)

(8+y-2) *8=                                           (y+4+6) *6

(y+6)*8 = (y+10) *6

distribute

8y+48 = 6y +60

subtract 6y from each side

2y +48 = 60

subtract 48 from each side

2y = 12

divide by 2

y = 6

sv =     (y+4+6)

sv   = 6+4+6

sv = 16