Which angles in the pictures are not supplementary ?

a. 4 and 1; 3 and 4
b. 1 and 3; 2 and 4
c. 1 and 2; 2 and 3
d. 2 and 3; 1 and 4

B
Reason: 1 and 3 are vertically opposite as well as 2 and 4 are also vertically opposite angles!

What is the inequality?

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.