At the airport, each piece of luggage to be checked in must weigh at most 45 pounds. Use w to represent the weight (in pounds) of a piece of luggage that can be checked in.

its 4 because 2 times 2 is 4, if you double the number two you get four

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

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)