Revenue - expenses = profit
25h - (750 + 110 + 75) > = 625
25h - 935 > = 625 <== ur inequality (simplified)
25h > = 625 + 935
25h > = 1560
h > = 1560/25
h > = 62.4 hrs <==
Those odd numbers are nine and seven.
26 because if you use the formula (x+y)/2 which makes it halfway in between.
Answer: There are 16 million different phone numbers possible.
First, let's find the number of possible phone numbers without the area code. There are 7 numbers in a phone number. There are 10 digits for each position. However, the first one can't be 1 or 0, so there are only 8 options.
Multiply the possibilities to find the total number.
8 x 10 x 10 x 10 x 10 x 10 x 10 = 8,000,000
Since, there are 2 different area codes, just multiply 8 million by 2 to get 16 million.