Plz math

what is 8.49×10−78.49×10−7 in decimal form?

a. 0.849

b. 0.849

c. 8,490,000

d. 849,000,000

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

What is the total surface area of this square pyramid?

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?