Find a12 in the arithmetic sequence if a1 = 20 and d = 2

The value of a is 42

Step-by-step explanation:

The explicit formula of the arithmetic sequence is a = a + (n - 1)d, where

∵ a = 20 ⇒ first term

∴ a = 20

∵ d = 2 ⇒ common difference

∵ We need to find a

∴ n = 12

→ Substitute them in the formula above

∵ a = 20 + (12 - 1)(2)

∴ a = 20 + (11)(2)

∴ a = 20 + 22

∴ a = 42

∴ The value of a is 42

d.) yes, because the volume of the cone is greater than the volume of the sphere

step-by-step explanation:

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