Which expressions are equivalent to 3(-2a-4)+3a

-6a-12+3a ?

3a+12 ?
or
none of the above

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Solve the equation by completing the square. x^2+2x=17

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance