Question

plz answer this question with explaination!!!!!urgent!!!!!!!

Answer 1

I think it is 1400 answer

Answer 2

to find number of numbers between 200 to 400 that are multiples of 7 use the formula 
tn=a+(n-1)d
399=203+(n-1)7
n=29

to find sum of 29 numbers that are multiples of 7 is Sn=n(a+tn)/2=29(203+399)/2=8729

Mark as brainliest.......