A radioactive substance of decaying so that the number of grams present after T days is given by the following function: A(t) = 450e ^ -0.04 t

question 1: How many grams are left after 8 days? (round to the nearest whole gram)

question 2: how long until 75 grams are left? (round to the nearest day)

the answer is a

step-by-step explanation:

answer: h

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.