Mary is making pillows for her life skills class. she bought 2 and 1/2 yards of fabric. her total cost was $15. what was the cost per yard?

$6.00 per yard

Step-by-step explanation:

Mary is making pillow for her life skills class.

She bought yards of fabric.

Her total cost of  yards of fabric = $15.00

The cost per yard =

                              = $6.00

$6.00 was the cost per yard.

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