Question

Question was provided via image upload.

Explanation:

Step1: Find coefficient

$\frac{15}{3}=5$

Step2: Find $x$ exponent

$7-3=4$

Step3: Find $y$ exponent

$5-2=3$

Step4: Identify growth rate form

$V(t)=P(1+r)^t$, so $1+r=1.08$

Step5: Calculate growth rate

$r=1.08-1=0.08=8\%$

Answer:

$5x^4y^3$
C. 8%