1.)what are the first and last term of an arithmetic sequence. when its arithmetic means are 35, 15 and -5
with solution pls :)
2.)Find the value of x if the arithmetic mean of 3 and 3x+5 is 8.
with solution pls ;)
3.)Find the value of a when the arithmetic mean of a+7 and 3a+9.
with solution pls. :) :)