Derek just buit a house. The area of his rectangular backyard is 2/3 of a square mile. The width of the yard is 3/4 of a square mile what is the length?

i need help with this too

Step-by-step explanation:

let me know if it’s correct

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)