The administrative assistant at a software company often provides breakfast when there is a morning meeting. For last week's sales meeting, she purchased 9 dozen doughnuts and 9 dozen croissants, spending a total of $135. In preparation for yesterday's safety meeting, she spent $102 on 8 dozen doughnuts and 6 dozen croissants. Assuming she purchased the items at the same bakery both times, how much does a dozen of each cost?​

answer: 25.4 units

step-by-step explanation: radius = 12.7 units

diameter = twice the radius

diameter = 12.7 x 2

= 25.4

a. she will receive a refund of $278.

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

the answer is d

hope this