Aprecious metal is a. an element with super and electric and thermal conductivity, high luster, and sensitivity. b. a highly sought after dense, shiny, soft precious metal that has been used as money for many centuries. c. an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity. d. a soft, sensitive, and lustrous element with the highest conductivity of any element.

c. an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°