Answer:
12
Step-by-step explanation:
A² + B² = C²
9² + B² = 15²
81 + B² = 225
B² = 144
B = 12
step by step
A=1/2h(B+b)
15=1/2h(4+1)
15/(4+1)=1/2h
15/5=1/2h
3=1/2h
h=2*3
h=6
480 students
600 x .80
Dividend
Divisor
and
9x+6