100 Points Question!!!
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Answered by
7
Answer:
Step-by-step explanation:
1)a30=a+29(d). a=-9
-9+29(-5). d=-5
= -9+(-145)
=-9-145
=-154
a30=-154
a20=a+19d
=-9+19(-5)
=-9+(-95)
= -9-95
= -104
a30-a20=-154-(-104)
=-154+104
=-50
a30-a20=-50
Second one is also dame but they are variables
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Answered by
27
Answer 1:
- Common difference = d
=] D = a2 - a1
=] D = -14 - (- 9)
=] D= -14 + 9
=] D = -5
- an = a + (n - 1) D
=] a_30 = a + 29d
=] -9 + 29 (-5)
=] -9 - 145
=] - 154
- a20 = a + 19 D
=] -9 + 19 (-5)
=] -9 - 95
=] - 104
Using values from both the above questions:
=] a30 - a20
=] -154 - (-104)
=] - 154 + 104
=] - 50
Answer 2:
=] A_30 =a + 29d
=] a_20 = a + 19d
=] a_30 -a_20 = 10d
=] 10 d
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