Answer:
88
Step-by-step explanation:
Given
x = 4y² - 12 ← substitute y = 5
x = 4(5)² - 12 = 4(25) - 12 = 100 - 12 = 88
The value of cos 4x from the given identity is 0.999
<h3>Trigonometry identity</h3>
Given the cosine identity
cos8x = 13/36
Determine the value of x
8x = arccos(13/36)
8x = 0.36111
x = 0.36111/8
x = 0.04514
Determine the value of cos4x
cos4x = cos4(0.04514)
cos4(0.04514) = 0.999
Hence the value of cos 4x from the given identity is 0.999
Learn more trig identity here; brainly.com/question/7331447
23.
Work:
5(6)-7
5(6)=30
30-7=23
The answer is 28.
Check: 28-12= 16
1/4 of 16= 4
3/4 of 16= 12
so Carmen takes 3/4 more time of the trip to the market when she return s home.
This equation is equal to 5*4 so it equals 20
