What is 8/64 in lowest terms

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

If f(x)=3 over x+2 - square root x-3 then f(7)=

Acertain group of women has a 0.640.64% rate of red/green color blindness. if a woman is randomly selected, what is the probability that she does not have red/green color blindness? what is the probability that the woman selected does not have red/green color blindness? nothing (type an integer or a decimal. do not round.)