Please answer this asap

Nine more than four times a number is the same as one less than twice the number. find the number?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20