What is -8, 7 reflected across the x axis?

(-8, 7) reflected across the x-axis would be (-8, -7).

Step-by-step explanation:

To reflect a point across the x-axis, all you have to do is invert the y-coordinate.

For the given point (-8, 7), the y-coordinate is 7. Just invert that number, meaning make a positive number into a negative, or a negative number into a positive.

(-8, 7) reflected across the x-axis would be (-8, -7).

a

step-by-step explanation:

a

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)