The temperature was 30 degrees. The temperature dropped 50 degrees. Then the temperature increased 5 degrees. What is the temperature now?

-15 degrees

Step-by-step explanation:

In order to get what I answered you first subtract 50 from 30 then you get -20 then it says the temperature increased by 5 so you add 5 to -20 and get -15. Also I don't know if it is in celcius or Fahrenheit but if that's all its asking then it should be right.

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".

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1