Please help the questions are in the picture above

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Alex's monthly take home pay is $2,500. what is the maximum bad debt payment he can maintain without being in credit overload?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6