Answer:
(-1, 5)
Step-by-step explanation:
3 [x + y = 4]
3x + 3y = 12
- 3x + 7y = 32
-4y = -20
y = 5
x + 5 = 4
x = -1
This is an arithmetic sequence because each term is 7 greater than the previous term, so 7 is what is called the common difference...
Any arithmetic sequence can be expressed as:
a(n)=a+d(n-1), a=first term, d=common difference, n=term number.
We know a=1 and d=7 so:
a(n)=1+7(n-1)
a(n)=1+7n-7
a(n)=7n-6
The above is the "rule" for the nth term.
I think it would me 568 m
Answer:
138.16
Step-by-step explanation:
Answer:
yes
Step-by-step explanation:
For the given sides to make a triangle.
The sum of any 2 sides must be greater than the third side
10 + 7 = 17 > 11
10 + 11 = 21 > 7
7 + 11 = 18 > 10
Thus the sides 10, 7, 11 will make a triangle