The average depth of water at the end of a dock is 8 feet. This varies 5 feet in both directions with the tide. Suppose there is a high tide a 4 AM.
If the tide goes from high to low every 8 hours, write a sine function, d(t)
describing the depth of the water as a function of time with t = 4
corresponding to 4 AM.
When will the tide first reach a depth of 3 feet?

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?

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

Tell whether the two rates form a proportion