21-6n+2(2n-5)-3n
First, multiply 2x2n and 2x-5
21-6n+4n-10-3n
Then rearrange the terms
4n-6n-3n+21-10
Then combine like terms
-5n+11
hope it helps!
Answer:
Step-by-step explanation:
(-2)^-3=
=
- = -0.125
Answer:
377.62 m³
Step-by-step explanation:
V = 16 × 3.95 × 8 - 8 × 3.95 × (8 - 3.95)
V = 377.62
Step-by-step explanation:
sin α - sin β = 2 cos (α + β)/2 sin (α - β)/2
sin 70° - sin 50° = sin 10°
2 cos (70° + 50°)/2 sin (70° - 50°)/2 = sin 10°
2 cos 120°/2 sin 20°/2 = sin 10°
2 cos 60° sin 10° = sin 10°
2 (½) sin 10° = sin 10°
sin 10° = sin 10° → <u>Proved</u>