Question

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

Answer 1

Answer:

(a)  121 miles

(b)  7 days

Step-by-step 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

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

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

$\sf \implies 7d=49$

$\sf \implies d=\pm\sqrt{49}$

$\sf \implies d=\pm7$

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

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

Answer 2

• 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