Please, please help (if you can)

A population of bacteria increases by 30 every hour. Is this situation linear or exponential?

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

What is the ratio of the length of an object in yards to the length of the same object in miles?

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?