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t4= −5 and t9 = 10. find t1and d. (when i mean t1 and t4, the numbers are small)

 May 1, 2020
 #1
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t4  = -5

t9 = 10

 

We have this

 

t9 =  t4  + d ( 9- 4)

 

10  = -5  + d (5)      add -5 to both sides

15  =  d (5)            divide both sides by 5

3  =  d

 

 

To find t1   we have

 

t4  = t1  + d ( 4 - 1)

-5  = t+ 3 ( 3)

-5 = t+  9          subtract  9 from both sides

-14  =  t1

 

 

cool cool cool

 May 1, 2020

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