Please someone help me

81

Step-by-step explanation:

The square of any binomial (ax + b) takes the form a²x² + 2abx + b²

We know a² = 1, meaning a = 1, and that 2ab = 18. So solve for b:

2 * 1 * b = 18

b = 9

Therefore the missing constant term is b² = 9² = 81

i pretty sure it is

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.