Wednesday

September 17, 2014

September 17, 2014

Posted by **molly** on Sunday, September 20, 2009 at 8:25pm.

- math -
**sydney**, Sunday, September 20, 2009 at 8:34pmtn = a1 + (n-1)d

t2 = 12 and t3 = 24 so d= 24-13=11

so we need to find a1

t2=a1 + (n-1)d

12 = a1 + (2-1)11

12 = a1 +11

1 = a1

then

t15 = 1 + (15-1)11

t15 = 1 + 154

t15 = 155

- math -
**maribel**, Sunday, September 20, 2009 at 8:40pmuse the arithmetic sequence formula

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

last=first+(number-1)difference

?=4+(15-1)20

?=284

im pretty sure lol

**Answer this Question**

**Related Questions**

geometry - How many different triangles can be constructed with toothpicks by ...

Math - Write two algebraic pattern rules for this toothpick pattern. Figure 1 = ...

Math Problem Solving - in a following pattern, one hexagon takes 5 toothpicks to...

math - PLEASE HELP ME ANSWER THIS QUESTION. THIS QUESTION IS HARD FOR ME AND i ...

Math - How do you go from 40,000 to 5,000 in Four steps? Step one: 40000 Step ...

Algebra - Debbie finished her algebra test early so she decided to check each of...

ALGEBRA HELP - When solving the equation, what property was used to go from step...

Quick math help - In which step below does a mistake first appear in simplifying...

Math (firstgrade) - Hello I am Amy.I am in first grade.I am 6 years old.I need ...

math/algebra - solve each of the following systems by substitution. 16) 5x -2y...