Answer:
It will take 146 days to earn an interest of $80.
Step-by-step explanation:
The simple interest formula is:
![I=\frac{P\times r\times t}{100}](https://tex.z-dn.net/?f=I%3D%5Cfrac%7BP%5Ctimes%20r%5Ctimes%20t%7D%7B100%7D)
It is provided that:
I = $80
P = $4,000
r = 5% p.a.
Compute the time required as follows:
![I=\frac{P\times r\times t}{100}](https://tex.z-dn.net/?f=I%3D%5Cfrac%7BP%5Ctimes%20r%5Ctimes%20t%7D%7B100%7D)
![t=\frac{I\times 100}{P\times r}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7BI%5Ctimes%20100%7D%7BP%5Ctimes%20r%7D)
![=\frac{80\times 100}{4000\times 5}\\\\=0.4\ \years\\\\=0.4\times 365\ days\\\\=146\ days](https://tex.z-dn.net/?f=%3D%5Cfrac%7B80%5Ctimes%20100%7D%7B4000%5Ctimes%205%7D%5C%5C%5C%5C%3D0.4%5C%20%5Cyears%5C%5C%5C%5C%3D0.4%5Ctimes%20365%5C%20days%5C%5C%5C%5C%3D146%5C%20days)
Thus, it will take 146 days to earn an interest of $80.
8 (D)
12(C) (Considering it is (square root of x) - 87, and not square root of (x-87).)
18(C) (Again, same as above. You need to write in parentheses, if applicable.)
13 I can't understand the question. Am I missing an equation?
Best answer me please.
Answer:
B -9<x-4 <9
Step-by-step explanation:
|x-4|<9 ➡ -9 < x-4 < 9
-5 <x <13
You can use the formula
speed=distance/time
20.88=145/x
x=145/20.88
x=6.9 hours -it will take 9 hours