Alexis has a rectangular piece of red paper that is 4cm wide.It’s length is twice it’s width she glues a rectangular piece of blue paper on on top of the red piece measuring 3cm by 7cm how many square cm will be visible on top

several answers are possible, since your setup and question were so vague

4*8 - 3*7 = ___
4*8 = ___
4*8 + 3*7 = ___

It's not my job to figure out what you mean.
It's your job to say it so clearly you cannot be misunderstood.

To find the visible area on top, we need to subtract the area of the blue paper from the area of the red paper.

Area of the red paper = length x width

Given that the width of the red paper is 4 cm and the length is twice the width, the length will be 4 cm x 2 = 8 cm.

Area of the red paper = 8 cm x 4 cm = 32 square cm.

Now, let's find the area of the blue paper.

Area of the blue paper = length x width

Given that the length of the blue paper is 7 cm and the width is 3 cm,

Area of the blue paper = 7 cm x 3 cm = 21 square cm.

Finally, we need to subtract the area of the blue paper from the area of the red paper to find the visible area on top.

Visible area on top = Area of the red paper - Area of the blue paper
= 32 square cm - 21 square cm
= 11 square cm.

Therefore, there will be 11 square cm visible on top.

To find the area of the visible part on top of the blue paper, we need to first find the area of the red paper.

Given that the red paper is 4cm wide and its length is twice its width, we can calculate the length of the red paper.

Width of the red paper = 4cm
Length of the red paper = 2 * Width = 2 * 4cm = 8cm

The area of the red paper is calculated by multiplying its length by its width:

Area of the red paper = Length * Width = 8cm * 4cm = 32 square cm

Now, the blue paper is glued on top of the red paper with dimensions of 3cm by 7cm. We want to find the area of the visible part on top.

To calculate the visible area, we need to subtract the area covered by the blue paper from the total area of the red paper.

Area of the blue paper = Length * Width = 3cm * 7cm = 21 square cm

Visible area on top = Total area of the red paper - Area of the blue paper
= 32 square cm - 21 square cm
= 11 square cm

Therefore, there will be 11 square cm visible on top.