13x-5=-18,because x =-1
1 answer:
You might be interested in
From the pool of 5 letters, we're picking 4. We can arrange the 4 we picked in 
ways.
But there are 5 ways of *not* picking the remaining letter. To account for the arrangements containing the letter not picked, we multiply this total by 5.
Put another way, suppose we drew a, b, c, and d, but not e. We have 24 possible arrangements for these 4 letters, but for any distinct arrangement there are 5 ways of replacing any letter with e.
So the number of arrangements we can actually make is
.
But there are 5 ways of *not* picking the remaining letter. To account for the arrangements containing the letter not picked, we multiply this total by 5.
Put another way, suppose we drew a, b, c, and d, but not e. We have 24 possible arrangements for these 4 letters, but for any distinct arrangement there are 5 ways of replacing any letter with e.
So the number of arrangements we can actually make is
Answer:
2500 pence (C = 2500)
Step-by-step explanation:
From the given information, t is the number of texts so essentially you will plug in the number of texts provided (150) in the place of the variable t.
Apply the same thing to minutes, plug in the number of minutes (50) in the place of the variable m.
Now multiply the substitutes with the co-efficient. (10*150=1500 & 20*50=1000)
Add the addends
C = 2500