Answer:

Step-by-step explanation:
We need to find the value of
.
C stands for combination.
The formula of combination is as follows :

Here,
n = 19 and r = 1
So,

So, the value of
is 19.
Answer:
a) -6
b) 9
c) 27
Step-by-step explanation:

Answer: 11
Step-by-step explanation: because I said so.
Answer:
a = -2
b = 7
Step-by-step explanation:
5a+3b=11
-2a+3=b
substitute for b:
5a + 3(-2a + 3) = 11
5a -6a + 9 = 11
-a = 2
a = -2
b = 7
Answer:
The correct answer is 11 x squared + 2 y + x squared minus 3 y
Step-by-step explanation:
Just took the test on Edg. Hope it helps :)