5n = 25
divide both sides by 5
n = 5
Sin²β +cos²β=1
cos²β=1-sin²β
cos²β=1-(4/7)²
cos²β=1-16/49=49/49-16/49=33/49
cosβ=√33/√49=√33/7
Answer:
The third one............
Answer:
A
Step-by-step explanation:
Answer:
Step-by-step explanation:
question 1. 13) 1/2 ( 4a + 12) =
(13(1/2) ) (4a) + (13(1/2) ) (12) = 26a+78
question 2. (14)(4)b2+3.5−2a+3.5b2−a
=56b2+3.5+−2a+3.5b2+−a
Combine Like Terms:
=56b2+3.5+−2a+3.5b2+−a
=(56b2+3.5b2)+(−2a+−a)+(3.5)
=59.5b2+−3a+3.5