Answer:
Using the definitions ....
a+2d = -9
a+7d = 26
subtract them:
5d = 35
d = 7 and a = -23
Now you can find any term in the sequence and should be able to answer
c)
Step-by-step explanation:
x=7
4(5x-2)=2(9x+3) do everything in the parentheses
20x-8=18x+6
+8 +8
20x=18x+14 get X by itself by adding same terms
20x=18x+14
-18x -18x
2x=14 divide
/2 /2
X=7
9
Because the Y's cancel out you add the absolute value of negative 5 and 4.
-5x+2y=23
hope it helps
4000 * .02= 80. 80 * 2.5= 200. 2.5 years.
3^-2=1/9
3^0=1
3^1=3
3^2=9