Answer:
a. pick two between 2,5 or 11, they are all primes.
b. it's 11 since

c. that's

(or think about it as half the half of 18, so half of 9)
d.

Rest can be written as a fraction
He will get 1111.111111 when he changes the money
Answer:
csc (- 30)° = - 2
Step-by-step explanation:
Using the trigonometric relationship
csc x =
and the exact value sin30° = 
sin(- 30)° = - sin30° = -
, thus
csc (- 30)° =
= - 2
Try to determine the value when they all add up. Or If you’re working with fractions try cross canceling