Answer:
=125
Step-by-step explanation:
5−7)(512)(5−2)
=
1
78125
(512)(5−2)
=
1
78125
(512)(5−2)
=(
1
78125
(244140625))(5−2)
=3125(5−2)
=3125(
1
25
)
=125
Answer:
4.1 years.
Step-by-step explanation:
We have been given that The Lisbon’s new heat pump cost $4,500. They bought it to replace their old furnace and air conditioner which cost about $2,800 a year to run. The heat pump will save them approximately 39% a year.
Yearly cost was 2800 at first and the pump will save 39% of 2800. So annual saving with new heat pump will be:

Let x be the number of years in which heat pump will pay for itself, so saving in x years will be:
Now let us equate the savings by new heat pump with cost of heat pump to find the number of years (x).


Therefore, the heat pump will pay for itself in 4.1 years.
Ed makes $50,000 a year just for having his job and does not have to do anything to earn this salary. He can sell zero computers and he still collects a paycheck. Most people are like Ed, they do nothing and collect a paycheck from their employer. So if you deduct his $50,000 base salary from his total income of $75,000, he made $25,000 in commission. That means he made this much dough from wheelin and dealin computers on the side. If Ed earns $100 from each extra deal, then $25,000 divided by $100 equals 250. Ed sold 250 computers last year. The correct equation is (A) 50,000 + 100X = 75,000. Base Salary + (Commission Fee x Computers Sold) = Total Income, where the unknown "X" is the number of computers sold by Ed.<span>hope this helps u:)</span>