Please A string is fixed at both ends. It’s first harmonic resonates with a frequency of 40hz. Which other frequencies will also resonate on this string. Select all that apply
60hz
80hz
120hz

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

prndulum needs thread, weight clock to time swings

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y