Students at Westbrook middle school hold green team meetings to plan ways to help protect the environment. This week there are 144 members at the meeting which is 90% of the total group?

160 members.

Step-by-step explanation:

Please consider the complete question.

Students at Westbrook Middle School hold green team meetings to plan ways to help  protect the environment. This week there are 144 members at the meeting, which is 90%  of the total group.  What is the total number of green team members?

Let x represent total number of green team members.

90% of total number of green team members would be .

Now we will equate 90% of total number of green team members with 144 and solve for x as:

Therefore, the total number of green team members is 160.

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.