I REALLY NEED HELP PLEASE PLEASE HELP
Using the diagram at the right, Find the measures of the following angles:
(FC is tangent to the circle)
m∠AEC=34
mDE=85

1. m∠ABC=

2. m∠DBC=

3. m∠ACE=

4. m∠DAE=

5. m∠ADE=

6. m∠FCB=

7. m∠CED=

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.