Matthew is 5 years older than twice the age of his sister. if matthew is 13, how old is his sister? 3 4 9 31
i think she is 3 or 4

What is the first step of an indirect proof of a number that is divisible by two

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

What is the value of x when x + 7 = 21?