4b^2 - 16 =
4(b^2 - 4) =
4(b + 2)(b - 2)
Answer:

Step-by-step explanation:

17 ÷ 2 = 8.5
8.5 as a mixed number is
.
Answer:
109.2
Step-by-step explanation:
If the number being divided does not end in 5 or 0, it being divided by 5 will not be equal. Therefor it might be better to try and use a calculator if you can't do it in your head.
Answer:36 postcards
Step-by-step explanation:
jenny bought 12 post cards
joe bought half of the postcards jenny bought = 12/2 = 6
ruth bought 3 times the postcards joe bought = 3 x 6 = 18
total postcards bought by all = 12 + 6 + 18 = 36 postcards
First you woyld find how many hours total he worked.

Then take the number of hours and multiply by the pay earned per hour.

They would make $360 per week.