Which expression would be easier simplify if you used the associative property to change the grouping? A. (3/2 + 5/2) + (-1/4)
B. -1/2 + [(5/3) + -(7/3)]
C. 14 + (20 + 80)
D. (27 + 4.5) + 1.5

A

Step-by-step explanation:

A is mental math.

D, first you got add the whole number and the decimal then add the other decimal.

Advice: Do the work that might help you. Also,make me Brainliest.

Thank you

C

Step-by-step explanation:

its C

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

if you was gonna solve for a, a is a   < -12