Answer: Have a good day. I’m sorry you have to go through this, my head already hurts and I am just lōoking at it.
By substitution.
Get y or x alone then insert it into the other equation solving for one of the two variables. After that substitute ur answer into one of the equations then solve.
<em>To solve for a variable, you just need to isolate the variable to one side.</em>
<h3>7.</h3>
For this, just divide both sides by r and <u>your answer will be
</u>
<h3>8.</h3>
For this, divide both sides by nR and <u>your answer will be
</u>
<h3>9.</h3>
Firstly, multiply both sides by T: 
Next, subtract FV on both sides of the equation: 
Lastly, multiply both sides by -1, and <u>your answer will be
</u>
<h3>10.</h3>
Firstly, multiply both sides by 1000: 
Lastly, divide both sides by tc and <u>your answer will be
</u>
Answer:
$83.88
Step-by-step explanation:
It will cost 83.88 because there are 12 months in a year, and since it's $6.99 every month we will have to multiply $6.99 by 12 which would give us $83.88