A bridge crossing a river can support at most 85,000 lbs. Suppose that the weights of automobiles using the bridge have mean weight 3,200 lbs and standard deviation 400 lbs. How many automobiles can use the bridge simultaneously so that the probability that the bridge is not damaged is at least 0.9

answer: 20

step-by-step explanation:

2500

step-by-step explanation:

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

sas (side angle side)

aa (angle angle)

sss(side side side)

sas find two sides with an angle in between

aa is finding two angles and the third will add up to 180

sss find all sides

step-by-step explanation: