You would change 22 to a decimal which would be .22 then multiply that by 900 which would be 198. So she spent 198 dollars on the phone
With simple interest, interest is calculated based on the original deposit only. The amount of interest earned in 1 year does not affect the amount of interest earned in following years.
With compound interest, interest is "compounded" or added a specific number of times per year. After the interest is added, the next time it is calculated, the amount is based on the total amount in the account.
For example, if we deposit $100 at 2% compound interest that is compounded yearly, the first year our interest would be 0.02(100) = $2. Before the interest is calculated the next year, this $2 is added to the account, making it $102. This is the value we use to calculate the next year's interest: 0.02(102) = $2.04.
Because of this, compound interest grows more quickly.
notice, we didn't use the negative value, valid though as it is, because in this case "a" can't be negative.
The two angles are identical:
3x -7 = 2x + 7
Add 7 to both sides:
3x = 2x + 14
Subtract 2x from both sides:
X = 14
The answer is c. How’s your day going? I hope it’s going good