Which expressions are equivalent to 4b? 1.b+2(b+2b)
2.3b+b 3.2(2b)

b+2(b+2b) = 7b so this is incorrect.

3b + b = 4b (correct)

2 * 2b = 4b (correct)

The answer is 3b + b and 2 (2b)

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