Paulo ran a marathon in about 1.56 x 10^4 s. What is Paulo’s time in standard notation?

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /