Anew savings account is opened with $800 and gains 4.5% annual interest continuously. how much is in the account after 3 years

a)$1013.21
b)$801.18
c)915.63
d)$3085.94

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

28

step-by-step explanation:

because that's the answer