Answer:
625b^6
Step-by-step explanation:
= 5^3 * 5b^6
= 5^3 * 5
= 625
Prime factor is a factor that is a prime number.
Prime factors of :
8 : 2 × 2 × 2. Also can be written as

12 : 2 × 2 × 3. Also can be written as

20 : 2 × 2 × 5. Also can be written as

30 : 2 × 3 × 5
56 : 2 × 2 × 2 ×7. Also can be written as

70 : 2 × 5 × 7
You can find all of them by using Factor Tree [ as shown in the picture] or Dividing by prime numbers.
I believe the answer is b because u need to combine like terms and 6c+2c+5c is 13c.
The answer is D. 48.
(3 x 40) + (3 x 8)
120 + 24
144
3 x Y = 144
Divide 144 by 3
144 / 3 = 48.
So the answer is 48.
Hope this helps!!