Step-by-step explanation:
a) 4 , 7 , 10 , . . . . .
Here we can see that ,
- Common difference = 10-7 = 3
- First term = 4.
We know the formula of nth term as ,
Sum of 20 terms as ,
b) -15 , -8 , -1 . . . . .
Here we can see that ,
- Common difference = -8+15 = 7.
- First term = (-15).
We know the formula of nth term as ,
Sum of 20 terms as ,
Answer:
up by 4 left by 2
Step-by-step explanation:
Answer:
50 problems total. We know part of this, because it is possible there is extra credit.
Step-by-step explanation:
Normally if you get 100%, you get all the problems right.
So.
86% of (Total problems) = 43 correct
If you divide 43 by 86%, you can get the total number of problems.
Total problems = 43/0.86 = 50 problems
From your great MysticChaCha. :-)