a = 7
d = 3
Now you can answer the questions:
T8 = a+7d
Sn = n/2 (2*7 + (n-1)*3) > 425
Scholmo reads 7 pages of his book on the first day and his rate of reading then goes up by 3 pages each day.
a) How many pages will he have read on the 8th day?
b) After how many days will he have read more than 425 pages?
1 answer
1 answer