Choose all of the equation that model the situation appropriately a) y=20(1+0.25)^x Models a growth rate of 25% b) y=50000(0.8)^x Models a decay rate of 80% c)y=20(-0.18)^x models decay rate of 18% d) y=75000(1.024)^x models an increase of 2.4%

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?