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

a

step-by-step explanation:

a

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: