At the shopping mall, Joaquin bought 4 pretzels and a bottle of water for $11.50. Kelly bought 3 pretzels and a bottle of water for $9.00. What is the price of a bottle of water?

$1.50

Step-by-step explanation:

They each bought one bottle of water, but one of them bought one less pretz l than th other. The difference in price is $2.50, which means a pretzel is 2.50 . Four pretzels would be $10, which leaves $1.50 fo the water. 3 pretzels would be 7.50, which leaves 1.50 for the water.

$1.50

Step-by-step explanation:

Let P be the price of a pretzel

and W be the price of a bottle of water.

We are told

[1]XXX4P+1W=11.50

[2]XXX3P+1W=9.00

Subtracting [2] from [1] we get

[3]XXX1P=2.50

Substituting 2.50 for P in [1], we get

[4]XXX4×2.50+1W=11.50

or

[5]XXX1W=1.50

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

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".