Sn=n/2[2a+(n-1)d]
s7 means n=7
a7=7/2[2(13)+(7-1)(3)]=7/2(44)=154
Ans:C
Answer:
{12, 16}
Step-by-step explanation:
The difference of two <em>numbers (x and y)</em> is 4. Thus, if y is the larger, then y - x = 4. Also, y = 2x - 8.
So we need to solve the system of linear equations
y - x = 4
y = 2x - 8
Subbing 2x - 8 for y, in the first equation, we get (2x - 8) - x = 4, or
x - 8 = 4, and conclude that x = 12. Then, because y - x = 4, y must be 16.
The numbers are 12 and 16.
C,
{(-1, -3),(0,-1),(1,1),(2,3),(3,5)}
Answer:
<h2>C. -5; -135, -10,935</h2>
Step-by-step explanation:
First one is 14
Second one is 45
Third one is 43
Fourth one is 40
