SAT math

posted by .

Set M consists of the consecutive integers from -15 to y, inclusive. If the sum of all the integers in set M is 70, How many numbers are in the set?
SAT prep help - Anonymous, Saturday, September 28, 2013 at 3:16pm
a. 33
b. 34
c. 35
d. 36
e. 37

• SAT math -

There are y+16 integers. We just want to sum an arithmetic sequence where
a = -15
d = 1 and find how many terms there are:

(y+16)/2 (-30+(y+15)*1) = 70
y = 19

So there are 19+16=35 terms

Similar Questions

1. math

Just a little stuck, can you help me out?
2. math check

Posted by TchrWill on Thursday, July 14, 2005 at 5:44pm. 2.)The sum of four consecutive odd integers is -336. Set up an equation AND solve for all of the integers. Two ways to approach this. -336/4 = -84 making the 4 consecutive odd …
3. Math

The average of a set of five different positive integers is 360. The two smallest integers in the set are 99 and 102. What is the largest possible integer in this set?
4. Math

The least integer of a set of consecutive integers is -48. if the sum of these integers is 49, how many integers are in the set?
5. Math

The least integer of a set of consecutive integers is -25 if the sum of these integers is 26,how many integers are in this set?

Please check urgently .I have to submit the assignment A give an example of a function whose domain equals the set of real numbers and whose range equals the set?
7. maths

explain why are the following not groups: 1)the set of Z integers with operation subtraction 2)The set of Z integers with operation addition 3)The set of R* of all non zero real numbers with addition
8. math

A set of integers has a sum of 420, and an average of 60. If one of the integers in the set is 120, what is average of the remaining integers in the set?
9. SAT prep help

Set M consists of the consecutive integers from -15 to y, inclusive. If the sum of all the integers in set M is 70, How many numbers are in the set?
10. Math

1. Set I contains six consecutive integers. Set J contains all integers that result from adding 3 to each of the integers in set I and also contains all integers that result from subtracting 3 from each of the integers in set I. How …

More Similar Questions