If it was physics or math try to solve all problems you have and try to search for more questions to solve the more you solve the more you will gain marks ,if it was a subject that needs to memorize write down the things you forget on nots and read them in the morning .. do not forget to take a break whenever you lose your passion just believe in yourself you can do it
Answer:
20 the answer is 20 because you plug in 4 for n.
Answer:
slope=2 and y intercept =1
Step-by-step explanation:
y=2x+1
y+2(0)+1
y=0+1
y=1
The double angle identities are
Then
The second identity together with the Pythagorean identity, 
, gives us another equivalent expression:
so
