The Foxy Lady Shop is having a summer closeout sale. A pair of jeans cost $20 and a t-shirt costs $9. If you spend $172 and buy a total of 13 items, how many pairs of jeans and t-shirts
can you purchase? ?

I need this to be solved using a matrix

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

Can you divide 25 into 4 equal groups? explain why or why not.

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.