18 because 6=22. 12=44. 18=66
tan x = sin x/cos x
cos³ x *tan²x - cos x = cos³x *(sin²x/ cos² x) - cos= cosx*sin²x - cos x =
= cos x(sin² x - 1) = - cos x(1 - sin²x)= - cosx*cos²x = - cos³ x
Answer:
50 mph
Step-by-step explanation:
The total distance is 350 miles.
The total time is 3 hr + (240 mi / 60 mph) = 7 hr.
The average speed is 350 mi / 7 hr = 50 mph.
1. QP = DU
2x + 7 = 26
2x = 26-7
2x = 19
x = 19/2
x =9.5
2. m<3 = m<2
16x -12 =52
16x = 52+12
16x = 64
x = 64/12
x = 5.33
4.m<2 + m<6 =90
70-4x + 18x -8 = 90
14x + 62 =90
14x = 90 -62
14x= 28
x = 28/14
x=2
5. 5x + 1 =42
5x = 41
x = 41/5
x = 8.2
