Simplify the expression (-5)2.

-10
10
-25
25

-10

Step-by-step explanation:

Combine the terms. When there are two terms attached by parenthesis, you multiply:

(-5)2 = -5 * 2

Note that when you multiply a negative term with a positive term, your answer will be negative:

-5 * 2 = -10

-10 is your answer.

~

Step-by-step explanation:

Multiply the numbers

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)