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What is the 21st term of the sequence with a1 = -7 and d = 3?
A . -4
B . -11
C . -21
D . 53

Sagot :

MrRoyal

Answer:

[tex]T_{21} = 53[/tex]

Step-by-step explanation:

Given

[tex]a = -7[/tex]

[tex]d = 3[/tex]

Required

Determine [tex]T_{21}[/tex]

This is calculated using sum of Ap formula

[tex]T_n = a + (n - 1)d[/tex]

In this case:

[tex]n =21[/tex]

So, the equation becomes

[tex]T_{21} = -7 + (21 - 1) * 3[/tex]

[tex]T_{21} = -7 + 20 * 3[/tex]

[tex]T_{21} = -7 + 60[/tex]

[tex]T_{21} = 53[/tex]

Answer:

53

Step-by-step explanation:

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