<span> (x+7) (x-7)
= x^2 - 49
using a^2 - b^2 = (A + b)(a - b)
hope it helps</span>
25-4^2/8=
4^2= 16
16/8= 2
25-2=23
The answer to the first question is 23.
12*5-8/4+7*2=
12*5= 60
8/4= 2
7*2= 14
60-2+14= 72
The answer to the second question is 72.
Number one is 23.
Number two is 72.
Bacteria length = 1mm
It will triple four times by 40 min.
This can be shown as 3 to the power of 4; 3⁴ = 81
Original length * growth factor = final length
1 mm * 81 = final length
81 = final length
After 40 mins, the bacteria colony will be 81 mm in length.
The answer is 810 the digit would be 9 then you multiply by 90 it is 810
I hoped this helped!
Answer:
53900% is the percent increase