Answer:
64.69e221
Step-by-step explanation:
When choosing, the combination formula for selection is used. That is when selecting "r" number of items from a possible "n" items, then the number of ways is denoted as:
nCr = n! / (n-r)! × r!
Since 66 string quartet have to be chosen and the 3 genres must be equally represented in the string quartet, then we must have 22 number of each genre in it.
Number of ways to select 22 mendelssohn from possible 66 = 66C22 = 1.82 × 10^17
Number of ways to select 22 Beethoven from possible 1616 = 1616C22 = 2.97 × 10^49
Number of ways to select 22 Haydn from possible 6868 = 6868C22 = 2.2 × 10^63
Total number of ways to arrange these 66 schedules = 66! = 5.44 × 10^92
Number of possible schedule = [1.82 * 10^17] * [2.97*10^49] * [2.2*10^63] * [5.44*10^92]
=64.69 ×10^221. ≈64.69e221
You can write 1 + -1 as 1 + 1
1 - -1 can be written as 1 +1
Answer:
y=x^2-4x-3
Step-by-step explanation:
y= (x-2x -1)(х+3)
= x^2+3x-2x^2-6x-x-3
= -x^2-4x-3
Step-by-step explanation:
-1/3x +1=-7
- -1/3x=-7-1
- -1/3x=-8
- -1=-8×3x
- -1=-24x
- x=-1/-24
- x=0.041 or 1/24