8x−20
Apply the distributive property to factor out the greatest common factor.

4(2x - 5)

Step-by-step explanation:

I hope that helps.

4(2x - 5)

Step-by-step explanation:

factors of 8 : (2, 2), 2

             20 : (2, 2), 5

Therefore the GCF is 2*2 = 4

8x/4 = 2x and -20/4 = -5

4(2x - 5) = 8x - 20

d. C=0.46(w-5)+9.7

Step-by-step explanation:

the cost of having a package delivered has a base fee of $9.70, that means that independently of the pounds of the package, the cost is always going to be $9.70

Then, there is an additional cost, that just count if the package have more than 5 lbs. Every pound over this 5 lbs, cost $0.46 per pound. So, the additional cost is:

0.46*(w-5)

Where (w-5) are the number of pound that over 5 lbs.

Finally the total cost is the sum of the base cost and the additional cost, that can be written as:

C=0.46*(w-5)+9.7