The amount of time a certain brand of light bulb lasts is normally distribued with a nean of 1900 hours and a standard deviation of 45 hours. Out of 670 freshly installed
ight bulbs in a new large building, how many would be expected to last more than
1890 hours, to the nearest whole number?

answer: 1, 3 and 5 are correct

step-by-step explanation:

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

no i do not : ( what is it?

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.