If T= 101+102+103+...+199 find T

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.

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.)

If a + b = 28 and a - b = 10, then b =?