Y у
45°
x 100°
y = [ ? 1°

45°+80°+y=180°

125°+y=180°

y=180°-125°

y=155°

b) 36

step-by-step explanation:

18 times 2 is 36

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.