A fish swims at 10ft below sea level, and then swims another 10 ft deeper to avoid a shark. Write an addition expression that represents this situation

0+10=10+10=20

20ft

Step-by-step explanation:

is this what you need?

(-10)+(-10)=-20 or -10-10=-20

Step-by-step explanation:

(-10)+(-10)=-20

plus and minus change to ngative so another way to write the equation above is:

-10-10=-20

i used negatives because the fish was below sea level

72 is the answer to this problem

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.