En Mercurio las cosas pesan 4 veces menos que en la Tierra. Si un objeto pesa 30 kg en Mercurio, ¿Cuánto pesará en la Tierra? A- ¿26 kg? B- ¿120 kg? C- ¿7,5? D- ¿34 kg?

120 kg pesa el objeto en la tierra

Explicación paso a paso:

Tierra. Mercurio

1kg 1/4 kg

¿? 30gk

Regla de tres..

1X30 ÷ (1/4)

= 120 kg pesa el objeto en la tierra.

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".