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1. D.)28.26 m^2

2.) A.)377 mm

4.) 615.75 square inches^3

Step-by-step explanation:

1.) Formula: π(r)^2

(3)^2=9

9π=28.27

2.) Formula for circumference: 2πr

D=120

Half the diameter is the radius: 60

60(2)=120

120(π)= 376.99

376.99 is close to 377

4.) Formula: (r)^2(pi)

D=28

R=14

14^2=196

196(pi)

615.75 square inches^3

Keep in mind, I used the symbol pi and not 3.14 so it's mostly accurate and a bit slightly off.

Hope this helps! :)

77

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