Answer:
B
Step-by-step explanation:
The exponential decay formula is
y= ab^x
where a is the initial value and
b = 1- decay rate
b= .9
.9 = 1 - decay rate
Subtract 1 from each side
.9-1 = 1-1-decay rate
-.1 = -decay rate
Multiply by -1
.1 = decay rate
Change to a percent
10 % = decay rate
You have to move the decimal four (note the exponent) places to the left so the decimal is directly after the first number. You have to drop the zero because it's not significant. The answer is 1.958 x 10^4
Addition: -9 + -2 = -11
Substraction: -9 - 2 = -11
i know its the frist or second one i did the test i am also in flvs :)
Written form is just how you would usually see a number. So it would be 3,680,010.