Answer:
40
Step-by-step explanation:
EF = 5/2 *BC
EF = 5/2 * 16
EF = 5* 8
EF = 40
AREA OF A REGULAR OCTAGON FORMULA:
A = 2 (1 + √2) a²
A = 2 * (1 + √2) * 14²
A = 2 * (1 + 1.414) * 196
A = 2 * 2.414 * 196
A = 4.828 * 196
A = 946.288 cm²
(x²+9)*(25(x²-4x+4))
x=±√-36/2, so x=±3i
x=4±√(16-16)/2, so x=2 is a double root
depends on how your teacher instructed you to county roots. there are 2 complex solutions and two real solutions because 2 is a double root. that would be D. however there are only 3 DISTINCT roots, , 3i, -3i, and 2 which would be C. The CORRECT answer to a mathematician would be D