On a particular day, the wind added 4 miles per hour to jaime's rate when she was rowing with the wind and subtracted 4 miles per hour from her rate on her return trip
jaime found that in the same amount of time she could row 57 miles with the wind, she could go only 33 miles against the wind.
what is her normal rowing speed with no wind?

15 miles per hour.

Step-by-step explanation:

Let x be her speed with no wind.

speed = distance / time.

With the wind:

x + 4 = 57 / t

t(x + 4) = 57

t = 57 / (x + 4)

Against the wind:

x - 4 = 33 / t

t = 33 / (x - 4)

Eliminating t from the 2 equations in bold we have:

57 / (x + 4)  = 33 / (x - 4)

57(x - 4) = 33(x + 4)

57x - 228 = 33x + 132

24x = 360

x = 360/24

x = 15 miles per hour.

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".

7

step-by-step explanation: