Time and a quarter means that she is paid 25% (1/4) more than her basic wage.
So find 25% of 3.75 and add it to 3.75. Since she worked 6 hours at that new wage, multiply 6 times her new wage.
Time and a half means that she is paid 50% (1/2) more than her basic wage.
So find 50% of 3.75 and add it to 3.75. She worked 8 hours at that new wage, so multiply 8 times her new wage.
Double time means that she is paid twice as much as her normal wage.
So multiply her basic wage by two and then multiply by 5 since she worked 5 hours at the wage.
(a) Add all of that and you get her overtime wage.
(b) Her basic wage is for the week is 40 hours times her basic wage.
(c) Her gross wage for the week is the total of her basic wage and her overtime wage.
Have fun.