Answer:
<em>y = 150</em>
Step-by-step explanation:
<u>Proportions</u>
It's given y is directly proportional to the square of x-1. It can be expressed as:
Where k is the constant of proportionality. We know y=24 when x=3. Substituting:
Solving for k:
k = 24/4 = 6
Thus, the equation is:
When x=6:
y = 150
90-60+50-65=15
$15 in her account