3 years ago

The mean of 4 scores is 27. If three of the scores are 18, 29, 43, find the sum of the scores.

Mathematics

2 answers:

aliya0001 [1]3 years ago

8 0

Answer:

90 plus what the other number is

Step-by-step explanation:

11111nata11111 [884]3 years ago

6 0

Answer:

the missing number out of the four is 18 so if we add 18+29+43+18 then we get 108

the sum of the scores is 108

Step-by-step explanation:

hope this helps

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Find sin x/2, cos x/2, and tan x/2, if cos x = -12/13, 180 degrees is less than x which is less than 270 degrees

Rashid [163]

Cos x = -12/13
sin x = -sqrt(13^2 - 12^2) / 13 = -5/13
tan x = 5/12

tan x/2 = (1 - cos x) / sin x = 1 - (-12/13) / -5/13 = 25/13 * -13/5 = -5

2sin^2 x/2 = 1 - cos x = 1 - (-12/13) = 25/13
sin^2 x/2 = 25/13 / 2 = 25/26
sin x/2 = 5/√26

sin x/2 / cos x/2 = tan x/2
cos x/2 = sin x/2 / tan x/2 = 5/√26 / -5 = -1/√26

sin x/2 = 5/√26
cos x/2 = -1/√26
tan x/2 = -5

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2 years ago

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2 years ago

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