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k = -3.8

Step-by-step explanation:

Equation Solving

We are given the equation:

k + 7.2 = 3.4

To solve the equation we must make k the subject, that is, isolate the letter k at the left side of the equation.

Since the number 7.2 is adding with k, we subtract 7.2 on both sides:

k + 7.2 - 7.2 = 3.4 - 7.2

Simplifying the left side, the numbers cancel:

k = 3.4 - 7.2

Now calculate the subtraction 3.4-7.2=-3.8

k = -3.8

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)