Answer:

Step-by-step explanation:

Add 9 to both sides:


Subtract 6a from both sides:


Divide both sides by -8:


The variable X is equal to 16
Answer:
27 pi
Step-by-step explanation:
First find the area of a circle
A = pi r^2
A = pi ^^2
36 pi
We know this is 3/4 of a circle so multiply the area by 3/4
3/4 * 36 pi
27 pi
Y=8.25x+10
10 is the allowance plus the 8.25 times x which is the hours
Going by the formula, Half-Life = ln(.5) / k
Half-Life = .693147 / .1205
Half-Life = 5.75 days and rounded to nearest tenth,
Half-Life = 5.8 days