What's equivalent to the ratio 600: 350

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

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

The first term of a sequence is -12. the recursive formula for the sequence is an = an-1 + 9. what are the next 3 terms in the sequence? a) -3, -15, -27 b) -3, 6, 15 c) -3, -6, -3 d) -3, -6, 3