What is the vertex of f(x)=x^2 + 10x- 9?

First convert x^2 + 10x - 9 to vertex form and you will get

f(x) = (x-5)^2 - 34 This means that the vertex must be (5, 34)

both equations and proportions are better.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles