It took 7 hours to mow 4 lawns; at that rate, how many lawns could be mowed in 21 hours

12

Step-by-step explanation:

7x3=21

3x4=12

boOM

Hope This Helps

<3

4 lawns were mowed in 7 hours, so if 7 x 3 = 21.

Then you can mow 12 lawns in 21 hours

4 lawns each 7 hours.

Step-by-step explanation:

answer: okw

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