=3cisπ =5cis(π/2) if *=a1+b2 than a= blank, and b=blank

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

Which geometric principle is used to justify the construction below?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.