Evaluate the expression 2n(n-1), when n =
= 3
A 11
B 12
C 17
D 18

The value of the expression is 12 ⇒ B

Step-by-step explanation:

Let us solve the question

∵ The expression is 2n(n - 1)

→ Simplify it at first by multiply 2n by the bracket (n - 1)

∵ 2n(n - 1) = 2n(n) - 2n(1)

∴ 2n(n - 1) = 2n² - 2n

∵ n = 3

→ Substitute n by 3 in the expression to find its value

∴ 2n² - 2n = 2(3)² - 2(3)

∴ 2n² - 2n = 2(9) - 6

∴ 2n² - 2n = 18 - 6

∴ 2n² - 2n = 12 ⇒ at n = 3

∴ The value of the expression is 12

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130

jbankston is right, use thhe link and you should find the answer.