Question

A population of 900 bears decreases by 15% per year. How many bears will there be in the population after 7 years? Round your answer to the nearest whole number.
a. 289
b. 2,394
c. 9
d. 795

17. What is the value of 12x^-3y^-1 for x=-1 and y=5?
a. -12/5
b. -180
c. 7,500
d. -5/12

Answer 1

@Phebe

Answer 2

What is the value of 12x^-3y^-1 for x=-1 and y=5? <---- that's pretty self-explanatory I'd think

Answer 3

im here

Answer 4

well @jdoe0001
is helping u
so ur good :)

Answer 5

for the 1st one, "bear" (pun intended), in mind that is a geometric sequence

on that case, I'd use the compound interest formula, which is really just a geometric sequence
\(\bf A=P\left(1+\frac{r}{n}\right)^{nt}
\\ \quad \\
A=\textit{current amount}\\
P=\textit{original amount}\\
r=rate\to r\%\to \frac{r}{100}\\
n=\textit{times it compounds per year}\\
t=years\to t\)

the bears are decreasing, so the rate is "negative"
is happening yearly, so the cycle or period is 1

Answer 6

hmmm
hold gthe mayo \(\bf \large A=P\left(1+\frac{{\color{brown}{ -r}}}{{\color{brown}{ 1}}}\right)^{{\color{brown}{ 1}}t}\)