Which of the following is the demerit of HYV seeds ? A) Excessive use of fertilizers B) Decreases the water table
C) Decreases the fertility of soil
D) All of the above

May someone explain how to do this question?

Ablock of steel has a density of 0.29lbs per cubic inch. if the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight? a. 0.29lbs b. 0.58lbs c. 0.87lbs d. 1lbs

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?