Please those who are expert with math, help me.

20

Step-by-step explanation:

opposite formula = - ( x )

here x is -20

- ( -20 )

20

+ 20

Step-by-step explanation:

Opposite of - 20

Multiply - 1 with - 20

= - 1 * - 20

= 20

= + 20

Note : -

- 20 is a negative number.

Opposite of negative number ( - ) is positive number ( + ).

Similarly,

Opposite of positive number ( + ) is negative number ( - ).

for GM, you find out the square root of the product of the numbers provided.

since 72 can be broken down into the product of 36 and 2. 6 being the square root of 36 comes out, leaving 2 behind.