Use sum of arithmetic series:
Sum of n terms = (n/2)(2a + (n - 1)d)
where a is the first term, -6
d is the common diff, 6 - 2 = 4
and n is the number of terms, 20
Sum of first 20 terms
= (20/2)(2(-6) + 19(4))
= 640
Answer:
how to set up problem: (7x-36)+(5x+12)=180
Answer:
Step-by-step explanation:
The saying for rounding is if the number is above 5 you round up and if it is below 5 you leave it the same. So this rounded whould be 59,425 by what you told me hoope that helps