A roller coaster at a theme park takes fans on an exciting ride. In the first 20 seconds, it carries its passengers up a 30-meter Hill, plunges them down 30 meters, and takes them back up a 15-meter rise. How much higher or lower from the start of the ride are they after these 20 seconds?

Iam so stuck. what is the worked out answer for this question?

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds. then use the distributive property and mental math to evaluate the expression.