Answer:
Carol has only 20p and 10p coins in her purse.
She has three times as many 20p coins as 10p coins. If Carol has £4.20 altogether, how many 20p coins does she have?
Answer:
i think its 234
Step-by-step explanation:
The cosine repeats itself every 360 degrees, and it mirrors at 0 and 180 degrees. It inverts around 90 and 270.
So without using a calculator, you can tell that:
cos(520)=cos(520-360)=cos(160)
cos(160) = cos(180-20) = cos(180+20) = cos(200)
cos(160) is NOT equal to cos(20), it would be -cos(20).
cos(160) = -cos(20) = -cos(-20)
So C is the only one unequal.
Answer:
144
Step-by-step explanation:
(81 - 9) * 2 = 144
work backwards, you now have 81 books. But you bought 9, so pretend you didn't buy the 9, means you would have 9 less books. so 81-9.
Then you multiply by 2 because originally you sold half of the books, so before you sold half, you had double the amount, so you multiply that by 2.
Answer: option C
find f(x) - g(x)
f(x)= 
g(x) = 
To find f(x) - g(x) we plug in the functions and subtract
Remove the parenthesis and change the sign of each term
Combine like terms
So option C is correct
