Danielle needs to walk 4 miles. if she wants to reach her destination in 50 minutes ( hour), how fast does she need to walk? a.200 miles per hour b.4.8 miles per hour c.12.5 miles per hour d.3.3 miles per hour

B. 4.8 miles per hour

Step-by-step explanation:

We are given that,

Distance needed to walk by Danielle = 4 miles

Time needed to reach the destination = 50 minutes = 0.83 miles

It is required to find the speed needed by Danielle.

Since, we know,

i.e.

i.e. Speed = 4.8 miles per hour

Hence, she needs to walk 4.8 miles per hour to reach her destination.

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".