"9. if a is a non-zero constant, determine the vertex of the function y = -x2 + 4ax + 3 in terms of a. a) (2a, 4a2 + 3) b) (-2a, 12a2 + 3) c) (a, 3a2 + 3) d) (-a, -5a2 + 3) e) none of these

19.side- angle- side

20. angle- side- angle

step-by-step explanation:

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.