Martha has $100 in a savings account. Every month, she deposits $250 into her savings account. She sees an advertisement for a new refrigerator that’s available for $1,200. She calls the store and talks to a salesperson, who says she can purchase the refrigerator interest free by paying $80 per month until the balance of the purchase is paid. At the end of months, she still has owes $720 for the refrigerator.

The answer Is 6 months. At the end of 6 months, she still owes $720 for the refrigerator.

Step-by-step explanation:

If your paying $80 per month for a fridge that costs $1200 it will take 15 months to pay for it. If you have $720 left to pay you divide that by $80(payment rate per month)which gives you 9 (months) and that is how many months you have left to pay for it, But you're looking for how many months you have already payed for it so you would subtract 9 from 15 and that gives you 6, which is the number of months you have already payed for it.

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west