9x^2-10x=0
D= b^2-4ac
b=-10
a=9
c=0
D=(-10)^2-4*9*0=10^2-0=100
A. is 20ft I believe but I don't know the other one
B if you multiply x and y by 2 there you go!!
Answer:
i believe the answer would be B
Step-by-step explanation:
Answer:
320km/h
Step-by-step explanation:
You simply times 80 km by 4hr to get 320 km/h