The mean midday temperature recorded in june in a city in south california is 36ºc, and the standard deviation is 3ºc. assuming the data is normally distributed, the number of days in june when the midday temperature was between 39ºc and 42ºc is?

step-by-step explanation:

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 first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

hc ghfrfgb

step-by-step explanation:

gedfgb nbgfrezrdfgbn bgfderdfgbvn bvfdsvcb bvfdfgb gfdgb gfr