It's b, because the function is decreasing (a<0).
Answer:
Step-by-step explanation:
Common ratio (r) = 2nd term / 1st term = 15/3 = 5
Recursive formula:
Explicit formula:
a = first term = 3
Answer:
88
Step-by-step explanation:
22 times 4 because 25 porcent is 1/4 of the total so 22 times 4 equal 88
Answer:
11 Hours
Step-by-step explanation:
Let's say Lisa makes x hours babysitting and y hours giving music lessons.
Because she worked a total of 18 hours, we know that x + y = 18.
5 * x is how much money she earns babysitting for x hours, while 12 * y is how much money she earns giving music lessons for y hours. Adding them up gives her total revenue:
5x + 12y = 139
We now have a system of equations. Let's multiply both sides of x + y = 18 by 12:
12 * (x + y) = 18 * 12
12x + 12y = 216
Now, subtract 5x + 12y = 139 from 12x + 12y = 216:
12x + 12y = 216
- 5x + 12y = 139
_________________
7x + 0y = 77
Divide both sides by 7:
x = 11
Thus, Lisa spent 11 hours babysitting.
The step of adding it to 0.25 (or 25/100, or 1/4) is indeed not relevant. 0.25 is rational.
A rational number added to a rational number gives a rational number. A rational added to an irrational number doesn't.
so effectively the task can be reduced to "wich one of these is a rational number?"
And that's only true for A. 2/9
All others can't be represented as a discrete/finite fraction / ratio.
