Ineed !
the picture below shows a portion of a river dam:

a right angle triangle is shown with the measure of the acute angle at the tip equal to 65 degrees and length of base equal to

which of the following can be used to calculate the height of the river dam?

145 divided by tan 65 degrees
145 cos 65°
145 divided by cos 65 degrees
145 tan 65°

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.