We have cos( x - y ) = cosxcoy + sinxsiny <=> cos ( π - x ) = cosπcosx + sinπsinx <=> cos ( π - x ) = (-1)cosx + 0sinx = -cosx;
Remember, you can do anything to an equation as long as you do it to both sides
times 4 both sides because we hate fractions
3x+8=16x-4
minus 3x both sides
8=13x-4
add 4 both sides
12=13x
divide both sides by 13
12/13=x
x=12/13
Answer:
2.49 a bag
Step-by-step explanation:
The answer is the top one. Let me know if you want me to explain it.
<h3>Calculate percentage of a number</h3>
For this, multiply 150 × .20 = 30
Therefore, 20% of 150 is 30.
- So, the correct option is "D".
See about percentages at: brainly.com/question/24209747
