Answer:
![\large\boxed{B.\ f(x)=4^x}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7BB.%5C%20f%28x%29%3D4%5Ex%7D)
Step-by-step explanation:
Exponential function
is
increasing if ![a > 1\to a\in(1,\ \infty)](https://tex.z-dn.net/?f=a%20%3E%201%5Cto%20a%5Cin%281%2C%5C%20%5Cinfty%29)
decreasing if ![0 < a < 1\to a\in(0,\ 1)](https://tex.z-dn.net/?f=0%20%3C%20a%20%3C%201%5Cto%20a%5Cin%280%2C%5C%201%29)
![A.\ f(x)=\left(\dfrac{1}{4}\right)^x\to a=\dfrac{1}{4}\in(0,\ 1)\to\text{decreasing}\\\\B.\ f(x)=4^x\to a=4\in(1,\ \infty)\to\text{increasing}\\\\C.\ f(x)=(0.4)^x\to a=0.4\in(0,\ 1)\to\text{decreasing}\\\\D.\ f(x)=\left(\dfrac{1}{2}\right)^x\to a=\dfrac{1}{2}\in(0,\ 1)\to\text{decreasing}](https://tex.z-dn.net/?f=A.%5C%20f%28x%29%3D%5Cleft%28%5Cdfrac%7B1%7D%7B4%7D%5Cright%29%5Ex%5Cto%20a%3D%5Cdfrac%7B1%7D%7B4%7D%5Cin%280%2C%5C%201%29%5Cto%5Ctext%7Bdecreasing%7D%5C%5C%5C%5CB.%5C%20f%28x%29%3D4%5Ex%5Cto%20a%3D4%5Cin%281%2C%5C%20%5Cinfty%29%5Cto%5Ctext%7Bincreasing%7D%5C%5C%5C%5CC.%5C%20f%28x%29%3D%280.4%29%5Ex%5Cto%20a%3D0.4%5Cin%280%2C%5C%201%29%5Cto%5Ctext%7Bdecreasing%7D%5C%5C%5C%5CD.%5C%20f%28x%29%3D%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5Ex%5Cto%20a%3D%5Cdfrac%7B1%7D%7B2%7D%5Cin%280%2C%5C%201%29%5Cto%5Ctext%7Bdecreasing%7D)
Answer:
look above
Step-by-step explanation:
hope it hepls
Imagine you're cutting off all of the slanted sides, there would be 3. Now since there's 4 feet on one side and 9 on the other when you cut off the edges they have side which are 3 feet (the end number) and 2.5 (9-4=5/2=2.5) now since you have three pieces like this, so put 2 together and you get a shape which is 3feet by 2.5 feet. The area of this is 3*2.5 which is 7.5, cut that in half for the third piece and you get 3.25, added together that's 10.75 squared feet. Now don't forget the 3 by 4 and 3 by 5 pieces. That would be a total of 27 (3*4=12 3*5=15) 27+10.75=37.75 squared feet.
Let me know if I made a mistake any where :)
18.100
<u><em>If you ask '' How do I solve these questions?'' I say:</em></u>
<em>We look at the tens digit to find the nearest hundred. If the number is 1,2,3 or 4, the tens and ones digit is reset. If it is 5,6,7,8 or 9, another hundred is added to the hundreds place of the number. The remaining tens and hundreds digits are reset</em>.
Just subtract to find the difference.
75 - (-25) = 75 + 25 = 100.
It is 100 degrees hotter in florida than alaska.