Answer:

Step-by-step explanation:
Use the exponential growth formula

Where A is the final amount in the account, P is the initial amount, r is the growth rate and t is the time in years
In this problem
We know that

So

Finally after 5 years the balance of the account is:

Two lines are perpendicular when the product between the slopes of the lines is equal to -1, then, if we have the following lines:

they will be perpendicular if,

According to the exercise, the first line is:

the slope for this line is -4.
Write the equation that makes two lines perpendicular,

solve for m2,

Answer:
The slope of the line perpendicular to y=-4x+7 is 1/4.
Answer:
D. -11/12
Step-by-step explanation:
Slope Formula: 
Simply plug in our coordinates:
m = (4 - 15)/(0 + 12)
m = -11/12