Answer:
Step-by-step explanation:
We are to show that 
<u>Proof:</u>
From trigonometry identity;


From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC
sin420cos140 - cos420sin140 = sin(420-140)
The resulting equation becomes;

= 
The collect 19 boxes by the end of everyday.
1. She got 9 questions wrong.
2. I believe the total is $44.80
The number of pieces made from rod is 49
<h3><u>Solution:</u></h3>
Given that A metal rod will be cut into pieces that are each 1/56 meters long
The rod is 7/8 meters long.
<em><u>To find: number of peices made from rod</u></em>
The number of peices made from rod can be calculated by dividing the total length of rod by length of each piece

Here total length of rod =
meters
length of each piece to be made =
meters
Substituting the values in above formula, we get


So the number of pieces made from rod is 49
Answer is
0.84375 :)
have a good dayy