Question

The surface area of a sphere is directly proportional to the square
of its radius.
A sphere of radius 10 cm must be increased to a radius of x cm if
its surface area is to be doubled. Find x.​

Answer 1

Answer:

acid is a chemical species that donates protons or hydrogen ions and/or accepts electrons. Most acids contain a hydrogen atom bonded that can release (dissociate) to yield a cation and an anion in water. The higher the concentration of hydrogen ions produced by an acid, the higher its acidity and the lower the pH of the solution

Answer 2

Answer:

Testosterone is the primary sex hormone and anabolic steroid in males.[3] In male humans, testosterone plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair. In addition, testosterone is involved in health and well-being,and the prevention of osteoporosis. Insufficient levels of testosterone in men may lead to abnormalities including frailty and bone loss.