Sam throws paper airplane. The height of the plane, in feet, can be modeled by the equation y=-162 -0.5)? + 9. What is the meaning of the vertex?
1) After 0.5 seconds, the airplane was 9 feet in the air.
2) After 16 seconds, the airplane was 9 feet in the air
3) After 9 seconds, the airplane was 0.5 feet in the air
4) After 8 seconds, the airplane was 0.5 feet in the air

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

the opening of this porabola is facing up

step-by-step explanation:

you divide them and then you get the answer i took this class this year

step-by-step explanation: