1. Find the smallest and the largest elements of the given set. Also the lub and glb whenever they exist.
(a) B= {2+1 | n Element of natural number }
(b) C = {2} 2 € (1,1)} U{|neN}
2. Using the Principle of Mathematical Induction, prove that
(a) 2^2n+1 +7 is a multiple of 3 for n greater than or equal to 1
B) n!>3^n

27

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

answer: the four apples you took away.

step-by-step explanation:

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64