Answer:
Step-by-step explanation:
Use proportions to solve:
a:
[tex]\frac{QP}{BA}=\frac{QR}{BC}[/tex]
[tex]\frac{a}{15} =\frac{35}{25}[/tex]
25a = 525
a = 21
b:
[tex]\frac{RP}{AC}=\frac{QR}{BC}[/tex]
[tex]\frac{b}{20}=\frac{35}{25}[/tex]
25b = 700
b = 28