Jeff had $46.18 in his wallet monday morning. he gave half of his money to his brother. he then bought two donuts for $0.75 each and a cup of coffee for $2.99. how much money did jeff have left?meee..

To start the day, Jeff had $46.18
he gave half to his brother so 
46.18/2 = 23.09
he has $23.09 left

he bought two donuts for $0.75 each
2 * 0.75 = $1.50
23.09 - 1.50 = 21.59
he now has $21.59

now he bought a coffee for $2.99
21.59-2.99= 18.60

Jeff has $18.60 left

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)