Amusic recording company has contracts with two bands. the cds of these bands are released in three countries, britain, canada, and australia. the total number of cds sold in each country is britain, 40,000; canada, 50,000; and australia, 30,000. the cost of advertising for both bands was $2 per cd in britain, $1.50 in canada, and $1 in australia. if matrix a = [2 1.5 1], what is matrix b if ab represents the total advertising cost (in dollars) for all three countries?

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

If the discriminant if a quadratic equation is 4 which statement describes the roots?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank