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

answer is x<

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

a is 8.b is 10.c is 10.5. d is -.5

step-by-step explanation:

just minus the smallest number from the biggest.