Every day the ocean has two low tides and two high tides. Function grepresents the height, in feet of the water level in a cove relative to the average sea level. Let trepresent the number of hours elapsed since the water height was equal to the average sea level after a low tide.
Plot the points where y(t) is equal to the average sea level.

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

the correct option is b

step-by-step explanation:

m∠a is 90°

m∠b is 40°

[2, 2.5)

(2.5, 3]

step-by-step explanation:

i think its these two not sure [2, 2.5)

(2.5, 3]