What is the graph of one cycle of a cosine curve with amplitude 4, period π/2, and a < 0?

Step-by-step explanation:

Alright, lets get started.

The amplitude is given as 4 means a is 4

Period is given as means

Cross multiply

Cos function will be

Please refer the diagram I have attached.

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.