Answer:
21
Step-by-step explanation:
Ok, so this may be confusing but I’ll explain.
Here is a very simplified diagram:
1-2, 1-3, 1-4, 1-5, 1-6, 1-7
2-3, 2-4, 2-5, 2-6, 2-7
3-4, 3-5, 3-6, 3-7
4-5, 4-6, 4-7
5-6, 5-7
6-7
*Note- I did this in about 30 seconds and on my phone so it is very simplified *
Each number, 1-7, is supposed to represent a different ingredient and they are put together to represent the two-ingredient combinations.
For example: 1-2 could represent pepperoni and sausage, and 1-5 could represent pepperoni and olives. This would mean that the 1 represents pepperoni, 2 represents sausage, and 5 represents olives.
If you count the number of combinations in each row, there are 21 combinations. This is because I made sure there are no repeats (2-3 AND 3-2) and because there wouldn’t be any doubles (1-1 or 2-2)
Answer:
b
a=1
Step-by-step explanation:
Answer:
(-1, 3)
Step-by-step explanation:
y=5x+8
y= -4x-1
5x+8= -4x-1
5x+4x= -1-8
9x= -9
x= -1
y=5(-1)+8
y= -5+8
y= 3
(-1, 3)
Answer:
defenitely not reflection im thinking either a or b leaning more towards a tho
Step-by-step explanation:
Answer:
So, the coefficient of x8 in the given expansion will be 210.
Step-by-step explanation:
We know,
General term in (x+a)n is given by,
Tr+1=C(n,r)xn−rar
∴ General term in (x2−1x)10 ,
Tr+1=C(10,r)(x2)10−r(−1x)r
⇒Tr+1=(−1)rC(10,r)x20−2rx−r
Now, we have to find the term having coefficient x8.
∴20−2r−r=8⇒r=4
So, T5 will have coefficient x8.
∴T5=(−1)4C(10,4)x8
⇒T5=10⋅9⋅8⋅74⋅3⋅2⋅1x8
⇒T5=210x8
