Which of the following is the result of expanding 5 £ n=1 (2n-2)?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places

Which is the standard form for this number? (2 x 10) + (5 x 1) + (8 x 1 10,000 )