The answer would be 12 dollars. you divide 84 by 7 and you end up with 12.
7,000,000+80,000+200+80+7
This translates to "a number" is greater than 45. All you have to do now is translate these words into an algebraic statement. Basically, you replace "a number" with the variable which it is defined for, and you use the "greater than" symbol to show that the variable is greater than the value of 45.