Question

Need some help with this question multiple choice please give me a decent response not a silly one ​

Answer 1

D. C = 480 - 60t

Step-by-step explanation:

Line segment for 4 ≤ t ≤ 8

Take two points: (4, 240), (8, 0)

Find slope:

`\sf slope: (y_2 - y_1)/(x_2 - x_1) \quad where\:(x_1,y_1),\:(x_2,y_2)\:are\:points`

`\sf \rightarrow slope: (0-240)/(8-4) = -60`

Find equation:

`\sf y - y_1 = m(x - x_1)`

`\sf \rightarrow C - 0 = -60(t - 8)`

`\sf \rightarrow C = -60t + 480`

`\sf \rightarrow C = 480-60t`