Answer:
$36
Step-by-step explanation:
- in the beginning $20 is %100 so divide 20 by 100 .
- you'll get .2 but to make this simple you'll want %10 so multiply .2 times 10 and you get 2 .
- now that 2 is %10 and you want %80 you multiply 2 8 times (or add it 8 times) because %10 times 8 = %80 so 2 times 8 = 16 .
- now that you have the %80 you want to add it to the %100 because they sold it for %80 then the price they bought if for (you get %180) .
- then you add the $20 to the $16 because that is what each percent equals (you get $36)
The opposite integer of 10 is -10
Answer:
(4b-9) (4b+9)
Step-by-step explanation:
16b^2 – 81
This is the difference of squares
(a^2 -c^2) = (a-c) (a+c)
a^2 = 16b^2 so a= 4b
c^2 = 81 so c = 9
(16b^2 – 81) = (4b-9) (4b+9)
Option: step 2.
Because the student divided only the right side by 2. If you divide one side by a number you have to do the same with the other side to maintain the equality.
