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a.

b. 16

Step-by-step explanation:

The area of a square is equal to the side length squared. Normally, the area of a rectangle is length times width but since all sides are equal in a square it is just the side times the side. This can be simplified to side length squared.

Since the side length is 4 the exponent form of the area is simply 4 squared or .

Then, compute this by multiplying 4*4. This equals 16 cms square.

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.

correct answer:

b.(19,-2)