The U. S. government spent nearly $10 billion planning and developing a nuclear waste facility at Yucca Mountain (Nevada), though the project was cancelled in 2011. The intent had been for the facility to store up to 77,000 metric tons of nuclear waste safely for at least 1 million years. Suppose it had been successful and stored the maximum amount of waste in the form of plutonium-239 with a half-life of 24,000 years. How much plutonium would have remained after 1 million years?

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.