Which expression correctly represents “twice the sum of four and a number”? 2(4+n) 2(4n) 2(4)+n 2+(4n)

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!