Thursday

September 18, 2014

September 18, 2014

Posted by **Riana** on Tuesday, January 1, 2013 at 7:56pm.

- math -
**Reiny**, Tuesday, January 1, 2013 at 8:03pmusing your arithmetic sequence definitions

t1 = a = 5

t20 = a+19d = 62

5+19d = 62

19d = 57

d = 3

sum(20) = (20/2)(first + last)

= 10(5+62) = 670

- math -
**Riana**, Tuesday, January 1, 2013 at 8:15pmhow did you gt 19d ?

- math -
**Reiny**, Tuesday, January 1, 2013 at 8:23pmThe formula for

term(n) = a + (n-1)d

so term(20) = a+19d

You MUST know these to be able to work with sequences

**Answer this Question**

**Related Questions**

MATH - a pile of bricks has 85 bricks in the bottom row, 79 bricks in the second...

Math - A pile of bricks has 85 bricks in the bottom row, 81 bricks in the second...

Math - Mike bought 252 bricks to build a wall in his yard. Each row has 14 ...

trigonometry - Find the number of cans stacked in a display if there are 30 rows...

maths - A brick wall is built by using 2 bricks less in each layer than in the ...

Math - Julia wants to build another garden wall, 10 bricks long and 3 bricks ...

Advanced Math - Find DE if matrix D= Row 1= -2,4,6 and ROW 2= 5,-7,1 and matrix ...

Math - an auditorium has 50 rows of seats. THe first row has 20 seats, the row ...

Math - The first row of a concert hall has 25 seats and each row after the first...

math (plz help) - In a movie theater, theater A has 30 seats in the first row. ...