Question

HELPPPPPPPP 50PTSSSSSS!!!!!!!!!

Answer 1

• L(d)=205-7d

#1

Paved area:-

• L(12)=205-7(12)=205-84=121mi

#b

Let's see

• 205-7d=156
• 7d=205-156
• 7d=49
• d=7days

Answer 2

(a) 121 miles

(b) 7 days

Explanation:

Given function:

`\sf L(d)=205-7d`

Question (a)

When d = 12:

`\sf \implies L(12)=205-7(12)`

`\sf =205-84`

`\sf =121 \ miles`

Therefore, the crew has 121 miles left to pave after 12 days.

Question (b)

When L(d) = 156

`\sf \implies 156=205-7d`

`\sf \implies 7d=205-156`

`\sf \implies 7d=49`

`\sf \implies d=\pm√(49)`

`\sf \implies d=\pm7`

As distance is positive,
`\sf d=7` only

Therefore, the crew has been paving the the road for 7 days.