By law of indices
a^(15-5)=
a^10
Answer:
Step-by-step explanation:
s= shirts
j= jeans
4s + 2j = 72
5s + 3j = 99
10s + 6j = 198
-12s - 6j = -216
-2s = -18
s = $9
4(9) + 2j = 72
36 + 2j = 72
2j = 36
j = $18
Given:
The equations of parabolas in the options.
To find:
The steepest parabola.
Solution:
We know that, if a parabola is defined as

Then, the greater absolute value of n, the steeper the parabola.
It can be written as


where
, the smaller absolute value of p, the steeper the parabola.
Now, find the value of |p| for eac equation
For option A, 
For option B, 
For option C, 
For option D, 
Since, the equation is option A has smallest value of |p|, therefore, the equation
represents the steepest parabola.
Hence, the correct option is A.
If one of them is wrong it is because it is blury! sorry!
13) 72/100