Answer:
At 0 hours, there are 100 grams of the substance remaining.
Step-by-step explanation:
I hope this helps you
f (x)=4x-x/6
f (x)=23x/6
6.f (x)=23x
x=6.f (x)/23
f^-1 (x)=6.x/23
11^2 * 3,14 = 380
380* (48-22) = 9880
4/3* 11^3* 3,14 = 5572,45
answer: 15452,45 cm
For the first one, the two in the middle apply. for the second one, they all apply
Let
x---------> represents Martin's sister's age
y--------> represents Martin's age
we know that
--------> equation 
--------> equation 
Substitute equation
in equation 
![x+[x-6]\leq 22\\2x\leq 22+6\\ x\leq 14](https://tex.z-dn.net/?f=%20x%2B%5Bx-6%5D%5Cleq%2022%5C%5C2x%5Cleq%2022%2B6%5C%5C%20x%5Cleq%2014)
therefore
<u>the answer is</u>
Part a) An inequality that can be used to represent this situation is
or 
Part b) the oldest age Martin's sister can be is
years old