Multiply (x^4-11x^2+30)by(x+2)

Ineed i do not understand i'm only 8

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?