If t is the amount of time she used it, then it lost t*(5/min) percentage points; then she charged it for 2t, so it gained (2t)*(2/min) =t*(4/min) percentage points.
This means that above this time period, the phone lost t*(5/min)-t*(4/min) =t*(1/min) percentage points; because this loss is recognized to be 10 percentage points, this means t*(1/min) =10, so t=10 min.
This means that she used her phone for 10 minutes and charged it for 20 minutes.
Ratio of rise can also mean the slope so let's find the slope given the two points.
slope formula;
m = y2 - y1/ x2 - x1 (3, 4), (-2, 0) (x1, y1), (x2, y2)
m = 0 - 4/ -2 - 3
m = -4/-5
m = 4/5
so your answer is B.
hope this helps, God bless!
Here is your answer

REASON:
[CONCEPT USED: <u>Unitary method</u>]
Number of pages typed by student in 1/5 hour = 2/3
No. of pages typed by the student in 1 hour= 
= 
= 10/3
=

So number of pages written in 1 hour are
3 pages and 1/3 of a page
HOPE IT IS USEFUL
Answer:
See below.
Step-by-step explanation:
Composition of the functions is sometimes commutative.
Under certain circumstances, they can be the same. However, most of the time, they are not commutative.
For instance, if we have f(x)=x^2 and g(x)=x^3, then:

Most of the time, however, this won't work.
Edit: Added an example.
Answer:
id k :)
Step-by-step explanation: