Answer:
see explanation
Step-by-step explanation:
Using the double angle identity for sine
sin2x = 2sinxcosx
Consider left side
cos20°cos40°cos80°
=
(2sin20°cos20°)cos40°cos80°
=
(2sin40°cos40°)cos80°
=
(sin80°cos80° )
=
(2sin80°cos80° )
=
. sin160°
=
. sin(180 - 20)°
=
. sin20°
=
= right side , thus proven
Answer:

Step By Step Explanation:
Subtract 2 From Both Sides

Simplify

Subtract 9x From Both Sides

Simplify

Multiply Both Sides By -1 (Reverse Inequality)

Simplify

Divide Both Sides By 2

Simplify

- Mordancy
Answer:
I believe the answer is B. Angle-Angle-Side
Step-by-step explanation:
Answer:
C
Step-by-step explanation:
gg
turn your percentage into a decimal. so 38. move your decimal 2 places to the left. which = .38
you do 288×.38=109.44
round the answer since it's 4 you make it 109
hope this helped :)