choice b is correct answer.
given expression is:
we have to represent above expression in factored form.
split the middle term of given expression so that the product of two terms should be -28 and their sum be 3.
make two groups and taking common,we get
taking (x-7) as common,we get
as we observed that -1 is common in last term of above expression.
take negative sign as common
-(x-7)(x+4) which is the answer we required.
the probability that it is an a is 1/7
we are given the following arithematic sequence and we are to find the 10th term in this sequence:
where is the number of the term.
to find the 10th term, we will simply substitute '10' in place of n in the above given formula:
therefore, the 10th term of this sequence is 330.