Alyssa had $289 to spend on seven books after buying them she had $16 how much did each book cost

The answer is $39 per book

Step-by-step explanation:

$273/7= $39/book

39*7=$273

Then you subtract: 289-273=$16

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

step-by-step explanation:

i have done this all on a piece of paper but idk how to put it on here cuz it needs to be drawn