Answer:
= 12
Step-by-step explanation:
{ 3 × - 3 } -3 × 4
Solve the brackets first
{3 × 9 - 3 } -3 × 4
{ 27 -3 } -3 × 4
24 - 3 × 4
24 - 12
= 12
Https://us-static.z-dn.net/files/db9/185b2fd8671d997f4457c16226cd4461.jpeg
As written, the exponent would be zero.
_____
The attached calculator display is set to scientific notation. The "E 0" indicates the exponent is zero.
This could be rephrased as:
You start with 100 grams of a substance. One year later you have 70 grams. What is the half-life?
We need this formula:
half-life = (time * natural log (2)) / natural log (beginning amount / ending amt)
half-life = (1 year * .69315) / natural log (100 / 70)
half-life = (.69315) / 0.35667494396
half-life = 1.9433661145 years
Rounding to nearest year half-life = 2 years
Sourse: https://www.1728.org/halflif2.htm
(See problem 3)