It says to simplify so number 3 would be 12

Number 4 is

Number 5 is
Answer:
Step-by-step explanation:
infinite and no solutions
Answer: 5.53
Step-by-step explanation:
this is a straight forward addition
2.5+3.03 =5.53
to be clear or to specify, use the decimal point to make the sum:
2.5 = 2 + 0.5 and 3.03 = 3 + 0.03
2+3= 5 and 0.5 + 0.03 = 0.53
5 + 0.53 = 5.53 (but this is to long just to make it clear)
She can expect 70 to be ads since there is 10 times more emails so 7 times 10 is 70 so 70 ads