3.) After working hard at Alexander Hall's cafeteria you've earned \$78. You want to go shopping and by some pair of jeans and t-shirts. Maximum number of items that you want to purchase is 8. The jeans are on sale for $22 and t-shirts for $8. How many jeans and t-shirts can you purchase with the money that you have. What if you had $156 ? Use linear algebraic operations, find the inverse, to solve the problem. 4.) Show Taylor series expansion of ln(x) up to 4th derivative with center at 1 . Show all of your work